
A Plain-Language Guide to Dietary Fats, What They Do, and How to Make Better Choices
The Fat Myth That Stuck Around Too Long
For decades, the American food industry sold us a story: fat is bad, and less of it is better. By the 1980s and 1990s, supermarket shelves sagged under the weight of fat-free cookies, low-fat chips, and reduced-fat everything. The problem, of course, was that when food companies stripped out the fat, they often replaced it with sugar and refined carbohydrates to maintain flavor — and Americans got sicker anyway. Heart disease rates climbed. Obesity rates climbed. And gradually, the nutrition science world came to a more nuanced conclusion: what kind of fat you eat matters far more than how much.
Today, the scientific consensus is clear enough that even cautious institutions like the American Heart Association and Harvard’s School of Public Health distinguish sharply between fats that harm us and fats that we actually need to survive. This article walks through the main types of dietary fat — where they come from, what they do in the body, and how the average American can make smarter choices without turning every meal into a chemistry lesson.
The Chemistry, Simply Put
You don’t need a biochemistry degree to understand dietary fat, but a little structural context goes a long way. All fats are built from molecules called fatty acids — long chains of carbon atoms linked together, with hydrogen atoms attached. The difference between fat types comes down to how those hydrogen atoms are arranged.
Saturated Fats
Saturated fats are “saturated” with hydrogen atoms — meaning every carbon in the chain is bonded to as many hydrogens as it can possibly hold. This gives them a rigid, tightly packed structure. The practical consequence? Most saturated fats are solid at room temperature — think of the white fat marbled through a raw steak, or a stick of butter sitting on a counter.
Unsaturated Fats
Unsaturated fats have at least one double bond between carbon atoms in the chain — which means they are missing some hydrogen atoms. That double bond creates a “kink” in the molecular chain, preventing the fat molecules from packing tightly together. The result is that Unsaturated Fats
Unsaturated fats have at least one double bond between carbon atoms in the chain — which means they are missing some hydrogen atoms. That double bond creates a “kink” in the molecular chain, preventing the fat molecules from packing tightly together. The result is that unsaturated fats are liquid at room temperature, olive oil being the most familiar example.
Within unsaturated fats, there are two important subtypes based on how many double bonds exist. Monounsaturated fats (MUFAs) have exactly one double bond. Polyunsaturated fats (PUFAs) have two or more. Both behave very differently in the body than saturated fats and generally, much more favorably.
Trans Fats: The Artificial Villain
Trans fats deserve their own brief mention because they are the one type of fat that virtually every credible nutrition authority agrees should be avoided as completely as possible. Most trans fats are artificially created through a process called partial hydrogenation — taking liquid vegetable oil and pumping hydrogen through it under high pressure to make it solid and shelf-stable. The result is partially hydrogenated oil, which was found in margarine, shortening, packaged cookies, and countless processed snacks for most of the twentieth century.
The FDA banned the addition of partially hydrogenated oils to U.S. food products based on overwhelming evidence that industrial trans fats raise “bad” LDL cholesterol, lower “good” HDL cholesterol, and significantly increase cardiovascular risk. Small amounts of naturally occurring trans fats are found in animal products like beef and dairy, and these appear to be metabolically distinct from industrial trans fats — less concerning but still something most experts recommend limiting.
Saturated Fats in Detail
Where They Come From
Saturated fats are found predominantly in animal products and a handful of tropical plant oils. The major food sources include fatty cuts of beef and pork, poultry skin, full-fat dairy products (butter, whole milk, cream, cheese), lard, and beef tallow. On the plant side, coconut oil and palm oil are notably high in saturated fat — which surprises many people who assume all plant-based oils are heart-healthy. Coconut oil in particular has been heavily marketed as a “superfood” in recent years, a claim that runs in conflict with the science.
What They Do in the Body
The relationship between saturated fat and cardiovascular health has been one of the most debated topics in nutrition science for the past two decades. The original view, dominant for most of the 20th century, was straightforward: eating saturated fat raises LDL (“bad”) cholesterol, and higher LDL raises the risk of heart disease and type 2 diabetes. That basic chain of reasoning is still supported by substantial evidence.
However, the picture has grown more complicated. Research over the past decade has raised legitimate questions about whether all saturated fats are equally problematic, and whether saturated fat in isolation — rather than as part of an overall dietary pattern — is the right thing to be measuring. A study cited by the National Institutes of Health found that replacing saturated fats with refined carbohydrates (which is what happened when Americans went fat-free in the 1980s) did not reduce cardiovascular risk. The key variable isn’t just removing saturated fat — it was what you replace it with.
The evidence clearly shows that replacing saturated fats with unsaturated fats reduces cardiovascular risk. Replacing them with sugar and white flour does not. That distinction has become the cornerstone of modern dietary fat guidance.
How Much Is Too Much?
Current guidance varies slightly between major health organizations, but the general range is consistent. The Dietary Guidelines for Americans recommends keeping saturated fat below 10% of total daily calories. The American Heart Association is more conservative, recommending below 6% — which for a 2,000-calorie diet works out to about 13 grams per day, roughly the amount in a single tablespoon of butter combined with a small handful of cheese.
Monounsaturated Fats (MUFAs)
Where They Come From
Monounsaturated fats are the dominant fat in olive oil, avocados, peanut oil, canola oil, and most nuts — including almonds, cashews, and hazelnuts. They are the nutritional backbone of the Mediterranean diet, which has been studied more extensively for cardiovascular benefit than perhaps any other dietary pattern in history.
Health Benefits
The evidence in favor of MUFAs is robust . Monounsaturated fats lower LDL cholesterol while maintaining levels of HDL (“good”) cholesterol when they replace saturated fat in the diet. A clinical trial called the OmniHeart study found that shifting to a diet rich in monounsaturated fats — compared to a carbohydrate-rich diet — lowered blood pressure, improved cholesterol profiles, and reduced estimated cardiovascular risk. Beyond the heart, research suggests that swapping saturated fats for MUFAs may also support modest weight and body fat reduction even without changing total calorie intake.
MUFAs are also notably stable at cooking temperatures, which makes olive oil a practical and healthy choice for most everyday cooking — sautéing vegetables, making salad dressings, or roasting proteins.
Polyunsaturated Fats (PUFAs) — The Essential Fats
Polyunsaturated fats are, in many ways, the most scientifically interesting category because they include the only two dietary fats that the human body genuinely cannot produce on its own and must obtain from food. These are called essential fatty acids, and they fall into two families: omega-3s and omega-6s.
Omega-3 Fatty Acids
What They Are and Where They Come From
Omega-3s are the fats most Americans have heard of in the context of fish oil supplements. The three main types are ALA (alpha-linolenic acid), EPA (eicosapentaenoic acid), and DHA (docosahexaenoic acid). ALA is found primarily in plant sources — walnuts, flaxseeds, chia seeds, and canola or soybean oil. EPA and DHA are found in fatty fish — salmon, sardines, mackerel, herring, and trout — as well as in algae-based oils, which is where fish get their omega-3s in the first place.
The body can convert ALA into EPA and DHA, but only very inefficiently. For practical purposes, regular fish consumption is the most reliable way to maintain adequate EPA and DHA levels. The American Heart Association recommends at least two servings of fatty fish per week for this reason.
Health Benefits
Omega-3 fatty acids are structural components of cell membranes throughout the body and serve as precursors to signaling molecules that regulate inflammation. Their most well-established benefits are cardiovascular: they reduce triglyceride levels, stabilize heart rhythms, and appear to lower the risk of sudden cardiac death. Beyond the heart, research suggests they play important roles in brain development (particularly during fetal development and infancy), may reduce the risk of certain neurodegenerative conditions, and have documented anti-inflammatory effects relevant to conditions like rheumatoid arthritis.
A recent review published in the journal Foods found that omega-3s may help delay the onset of neurodegenerative disorders such as Alzheimer’s and Parkinson’s disease, reduce depression, and contribute to cancer prevention, though the authors note that more research is needed to fully understand these relationships.
Omega-6 Fatty Acids
What They Are and Where They Come From
Omega-6 fatty acids are found in most vegetable oils — corn oil, soybean oil, sunflower oil, safflower oil — as well as in nuts, seeds, and poultry. Linoleic acid (LA) is the primary dietary omega-6 and is the only one classified as truly essential.
The Omega-6/Omega-3 Imbalance
Here is where things get complicated in a uniquely American way. The typical Western diet contains far more omega-6 fats than necessary and not nearly enough omega-3 fats. The ideal ratio of omega-6 to omega-3 in the diet is thought to be somewhere between 4:1 and 1:1. The actual ratio in the average American diet is estimated at anywhere from 15:1 to 20:1 — a dramatic imbalance driven by the ubiquity of processed foods and vegetable oils in the food supply.
This matters because omega-6 and omega-3 fatty acids compete for the same metabolic pathways in the body. While omega-6s in appropriate amounts are essential and beneficial, a chronically elevated omega-6 to omega-3 ratio is associated with increased inflammation and higher risk of coronary heart disease, hypertension, diabetes, rheumatoid arthritis, and some neurodegenerative conditions. The goal is not to eliminate omega-6s but to bring the ratio back into better balance — primarily by increasing omega-3 intake.
What a Healthy Fat Profile Actually Looks Like
Putting all of this together, what does a well-balanced dietary fat intake actually look like? The evidence points toward a few consistent principles.
In a typical healthy diet, 20–35% of total daily calories can come from fat. Within that total, the composition matters enormously. Unsaturated fats — both mono and polyunsaturated — should make up the bulk. Saturated fats should be limited to under 10% of daily calories by federal guidelines, or under 6% if you are following the American Heart Association’s more aggressive recommendation. Trans fats, the industrial kind, should be avoided as close to completely as possible.
The two truly essential fats — linoleic acid (omega-6) and alpha-linolenic acid (omega-3) — must come from the diet because the human body cannot synthesize them. Everything else the body can manufacture from raw materials, given enough of the right building blocks.
For omega-3s specifically, the WHO and EFSA recommend at least 250 mg per day of EPA + DHA. And recommend 1.6 grams of ALA per day for adult males and 1.1 grams for adult females. Most Americans fall well short of these targets.
Practical Ways to Shift Your Fat Intake
Dietary change works best when it’s specific and sustainable — not when it involves a complete pantry overhaul overnight. Here are evidence-based adjustments that can meaningfully improve the fat profile of a typical American diet.
Replace Saturated Fats With Unsaturated Fats at the Cooking Stage
Instead of frying or sautéing in butter, lard, or palm oil, switch to olive oil, avocado oil, or canola oil. This single substitution is one of the most consistently supported interventions in dietary fat research. For those who prefer a buttery flavor, using a small amount of butter blended with olive oil is a practical middle ground.
Eat Fatty Fish Twice a Week
Salmon, sardines, mackerel, herring, and trout are all excellent sources of EPA and DHA omega-3s. The American Heart Association’s recommendation of two fish servings per week is a well-established and achievable benchmark. Canned fish — particularly canned salmon and sardines — is inexpensive and just as nutritious as fresh. Tuna is an option but requires an larger serving.
Add Nuts, Seeds, and Avocados
A handful of walnuts (a particularly good plant source of ALA omega-3s), a tablespoon of ground flaxseed in yogurt or oatmeal, or half an avocado on toast are all straightforward ways to shift your fat intake in a healthier direction. Nuts and avocados are also rich in monounsaturated fats that support cholesterol health.
Choose Leaner Cuts of Meat
Selecting leaner cuts of beef and pork — those labeled “loin” or “round,” or ground meat that is 90–95% lean — can substantially reduce saturated fat intake without eliminating meat from the diet. Removing skin from poultry before cooking similarly reduces saturated fat in a simple and inexpensive way.
Read Labels for Trans Fats — Carefully
Food packaging can legally claim “0 grams of trans fat” if a product contains less than 0.5 grams per serving. If you eat multiple servings of such products, those fractions add up. The safeguard is to check the ingredient list for “partially hydrogenated oil” — if it appears anywhere, the product contains industrial trans fats., regardless of what the front label says.
Limit — Don’t Necessarily Eliminate — Saturated Fat
A realistic goal is not to strip all saturated fat from your diet but to keep it within the recommended range. Full-fat dairy in moderate amounts, an occasional burger, or butter used sparingly are unlikely to cause harm in the context of an otherwise balanced eating pattern. What matters most, as nutrition experts now emphasize, is the overall dietary pattern — not any single food or nutrient in isolation.
The Bottom Line
Fat is not a dietary villain. It is an essential macronutrient that the body depends on for energy, vitamin absorption, hormone production, brain function, and cell membrane integrity. The question has never really been whether to eat fat — it has always been which fats to prioritize.
The evidence points consistently in one direction: lean toward unsaturated fats (olive oil, nuts, avocados, fatty fish), keep saturated fat in check, avoid industrial trans fats entirely, and pay particular attention to getting enough omega-3 fatty acids, which most Americans chronically under-consume. These adjustments don’t require extreme dietary measures. They require informed choices made consistently — and that, ultimately, is the most sustainable kind of nutrition science.
Illustration generated by author using ChatGPT
Note: The core findings in this article — that unsaturated fats are preferable to saturated fats, that omega-3 and omega-6 fatty acids are essential, and that industrial trans fats are harmful — are supported by decades of research and endorsed by major health authorities including the American Heart Association, the NIH, and the 2025 Dietary Guidelines Advisory Committee. Some nuance remains in the saturated fat debate (particularly regarding specific saturated fatty acid subtypes and their varying cardiovascular effects), and the research on omega-3s and neurological disease is still evolving.
Medical Disclaimer
The information provided in this article is intended for general educational and informational purposes only and does not constitute medical advice. It should not be used as a substitute for professional medical advice, diagnosis, or treatment.
Always seek the guidance of a qualified healthcare provider with any questions you may have regarding a medical condition or treatment. Never disregard professional medical advice or delay seeking it because of something you have read here.
If you are experiencing a medical emergency, call 911 or your local emergency number immediately.
The author of this article is a licensed physician, but the views expressed here are solely those of the author and do not represent the official position of any hospital, health system, or medical organization with which the author may be affiliated.
Sources
Dietary Guidelines Advisory Committee — Food Sources of Saturated Fat (2025)
Harvard T.H. Chan School of Public Health — Types of Fat
American Heart Association — Saturated Fats
American Heart Association — Fats in Foods
Mayo Clinic — Dietary Fat: Know Which to Choose
Mayo Clinic — Trans Fat Is Double Trouble for Heart Health
Healthline — Saturated vs. Unsaturated Fat: Know the Facts
Healthline — Omega-3–6–9 Fatty Acids: A Complete Overview
NCBI/PMC — Monounsaturated Fat vs Saturated Fat: Effects on Cardio-Metabolic Health and Obesity
Linus Pauling Institute — Essential Fatty Acids
NIH — Omega-3 Fatty Acids Health Professional Fact Sheet
OCL Journal — The Omega-6/Omega-3 Fatty Acid Ratio: Health Implications
VA Nutrition Services — Common Fats and Oils (2024)
UMass Medical — Tips on Reducing Saturated Fat
MedlinePlus — Facts About Trans Fats
Brown University Health — The Truth About Trans Fats
University of Nebraska Extension — Omega-3 and Omega-6 Fatty Acids








Who Gets to Decide? The Modern Battle Over Books in America
By John Turley
On June 19, 2026
In Commentary, Politics
If you thought book banning was a relic of the past, think again. The United States is experiencing the most intense wave of book challenges in modern memory. Over the last four years, thousands of books have been removed from school and library shelves, sparking a national debate about parental rights, free expression, education, and the role of government.
At the center of the controversy is a simple but powerful question: Who gets to decide what children and communities are allowed to read?
We were casually looking for books to read with our grandson this year. He loves baseball so we were looking for books on that topic. Somehow we got on a site about banned books and, yes, there was a baseball story on the list, curiosity got us. The book is Baseball Saved Us by Ken Mochizuki and Dom Lee. This is the story about a baseball field that was created in a Japanese internment camp in during World War II and the prejudice they faced when they returned home after the war. The story, written on a fourth grade reading level, is about how the boys played baseball during their internment and how it helped them to survive. This is a banned book?? Why??
This made us wonder what it means to be on a “banned book list”. Just because it’s on the list does every library or school have to ban it? The answer is no, thank goodness. Members of library boards and school boards and parents play an important role and they have a lot to consider. Here are some interesting details about book banning in its current evolution.
The Scale of the Movement
The numbers are striking. According to PEN America, nearly 23,000 book bans have occurred in public schools since 2021. During the 2023–24 school year alone, more than 10,000 individual book bans were recorded. The following year saw nearly 7,000 additional bans affecting more than 3,700 unique titles.
Florida has led the nation in book removals for three consecutive years, followed by Texas and Tennessee. The American Library Association (ALA) documented more than 4,200 unique titles challenged in 2025, making it one of the highest years ever recorded.
Not every challenge results in a permanent ban. Some books are removed temporarily while review committees evaluate complaints. Others are eventually restored to shelves. Yet the sheer volume of challenges has significantly reduced access to books for many students and library users.
Supporters argue these actions protect children from inappropriate material. Critics view them as a growing campaign of censorship.
Which Books Are Being Targeted?
The books most frequently challenged share common themes.
According to the ALA, many complaints focus on books that discuss race, racism, gender identity, sexuality, or LGBTQ+ experiences. Others involve sexual content, abuse, violence, or mental health issues.
Among the most challenged books in recent years are Gender Queer by Maia Kobabe, The Perks of Being a Wallflower by Stephen Chbosky, Looking for Alaska by John Green, and several novels by Sarah J. Maas.
Classic works have also been caught in the controversy. Schools and districts in several states have removed or restricted books such as The Bluest Eye by Toni Morrison, The Kite Runner by Khaled Hosseini, and even George Orwell’s 1984.
Critics of the banning movement note that many of these books have been available in schools for years or even decades. They argue that the current challenges are less about newly discovered concerns and more about broader cultural and political disagreements.
Who Is Driving the Challenges?
One of the most significant developments is the changing source of complaints.
The ALA reports that in 2025, 92 percent of book challenges originated from organized groups, government officials, or political activists rather than individual parents. Twenty years earlier, most challenges came from local citizens raising concerns about specific books.
This shift suggests that book challenges have become part of a larger political movement rather than isolated local disputes.
Among the most visible organizations is Moms for Liberty, founded in Florida in 2021. Originally focused on opposition to COVID-19 school policies, the group later turned its attention to curriculum issues and library books. It now claims chapters in dozens of states and has become a major force in school board elections and library controversies.
Other organizations, including No Left Turn in Education, Citizens Defending Freedom, and various state-based groups, have pursued similar goals. These organizations often share lists of books to challenge, provide guidance to local activists, and coordinate campaigns across multiple communities.
Supporters describe these efforts as parental advocacy. Critics see them as organized attempts to impose political and ideological restrictions on public education.
The Political Connection
The book-banning movement has become closely associated with broader conservative politics, particularly the MAGA movement.
Moms for Liberty has maintained ties with the Heritage Foundation, the conservative think tank that developed Project 2025. The Heritage Foundation has sponsored Moms for Liberty events and honored the organization with awards recognizing its activism.
The relationship became even more visible when Moms for Liberty co-founder Tiffany Justice left the organization to lead the Heritage Foundation’s parental-rights initiative.
Former President Donald Trump has also embraced many of the same themes. He appeared at a Moms for Liberty national summit and has frequently criticized educational institutions, libraries, and schools that he believes promote what he describes as inappropriate or politically biased material.
Supporters view these alliances as part of a broader effort to restore parental control over education. Opponents argue they demonstrate that book challenges have become deeply intertwined with national political agendas.
Project 2025 and Libraries
Much attention has focused on Project 2025, the policy blueprint produced by the Heritage Foundation.
The document calls for stronger action against what its authors characterize as inappropriate materials in schools and libraries. Critics have highlighted language suggesting that educators and librarians who provide access to certain materials could face legal consequences.
Supporters argue that such proposals are intended to protect children from explicit content. Opponents contend that they would create a chilling effect, discouraging educators and librarians from offering books dealing with controversial subjects.
The debate reflects a broader disagreement about where the line should be drawn between protecting minors and preserving intellectual freedom.
How Libraries and Schools Are Responding
Responses vary widely across the country.
Some school districts remove challenged books immediately. Others establish review committees consisting of teachers, librarians, administrators, parents, and sometimes students. These committees examine books in their entirety before making recommendations.
Public libraries have generally been more resistant to removing books. Most rely on formal collection-development policies and challenge procedures designed to balance community concerns with principles of intellectual freedom.
Many libraries have retained challenged books after review, arguing that public libraries serve diverse populations and that parents should make reading decisions for their own children without limiting access for others.
At the same time, librarians in some states report increasing pressure from elected officials and advocacy groups. Concerns about funding, employment consequences, and potential legal liability have led some libraries to avoid purchasing controversial titles altogether.
Critics refer to this phenomenon as “preemptive censorship” because books disappear before formal challenges even occur.
State Governments Enter the Fight
Several states have moved beyond local challenges and enacted statewide policies.
Utah, South Carolina, and Tennessee have adopted mechanisms that allow certain books to be removed from schools statewide. Florida has expanded parental authority over educational materials and library collections.
Supporters argue these measures provide consistency and protect children across entire states. Critics counter that statewide restrictions eliminate local decision-making and reduce access to books for students whose families may have no objections to the material.
The controversy has occasionally reached dramatic levels. In Randolph County, North Carolina, county commissioners dissolved the public library board after it refused to remove a children’s book featuring a transgender character.
Such disputes illustrate how library policy has become a flashpoint in cultural conflicts.
The Courts Push Back
Many of these policies have faced legal challenges and the results have been mixed.
In Iowa, a federal judge blocked portions of a state law that prohibited books containing descriptions of sexual activity, ruling that the restrictions likely violated First Amendment protections. In the Rutherford County, Tennessee case, the first legal challenge to that state’s expanded book statute — a federal judge declined to issue a preliminary injunction, writing that a school board “has not prohibited students from reading the books or acquiring them elsewhere; instead, it has merely opted not to carry them on school library bookshelves.”
Courts have often struggled to balance competing interests. School boards possess significant authority over educational materials, while students have constitutional protections related to access to information.
The legal outcomes remain uncertain, but the judiciary has become one of the primary battlegrounds in the debate.
Voters Respond
School board elections have become another arena for the conflict.
In several Texas districts during 2025, voters removed incumbents who had championed aggressive book-removal policies. Similar results appeared in other states, suggesting that many voters are uncomfortable with the scope of current restrictions. At the same time, candidates supporting stricter controls continue to win elections in other communities.
The mixed results indicate that Americans remain deeply divided on the issue.
A Growing Countermovement
Opposition to book bans has generated its own political response. Organizations such as PEN America, the Authors Guild, the ALA, and numerous local advocacy groups have organized campaigns defending intellectual freedom. Several states have considered legislation designed to make book removals more difficult.
Minnesota, for example, has considered legislation that would prohibit the removal of books based primarily on ideological objections and would place greater authority in the hands of professional librarians.
Supporters argue such laws protect access to information. Critics contend they diminish parental influence and local control.
The Bottom Line
The modern book-banning movement is unlike anything seen in recent decades. Its scale is unprecedented, its organization is sophisticated, and its connections to broader political movements are well documented.
Supporters view the effort as a legitimate exercise of parental rights and community standards. Critics see it as an organized campaign to restrict access to ideas, experiences, and viewpoints that some groups find objectionable.
The debate is unlikely to disappear anytime soon. It touches fundamental questions about education, democracy, free speech, and the role of public institutions.
Who should decide what belongs on library shelves? Parents? Librarians? Teachers? School boards? Legislatures? Courts?
Americans have not reached a consensus on those questions. Until they do, the battle over books is likely to remain one of the most visible fronts in the nation’s ongoing culture wars.
Illustration generated by author using Chat GPT
Sources
PEN America — Book Bans Overview
PEN America — The Normalization of Book Banning (2024–25 Report)
American Library Association — Censorship by the Numbers
ALA — Most Challenged Books
NPR — ALA Releases 2025 Most Challenged Books
NPR — PEN America 2024–25 Report
Authors Guild — Voters Reject Book Restrictions, 2025
Washington Post — Trump, Moms for Liberty, Heritage Foundation
New Jersey Monitor — M4L Summit and Project 2025 Ties
GLAAD — Moms for Liberty and Book Bans
EveryLibrary Institute — Project 2025 and Libraries
I Love Libraries — Book Challenges Update
Freedom to Learn Foundation — 2025 State of Book Banning