Last Update: September 30, 2022
Medically Review by Dr. Mark Hyman
“Everyone seems to be talking about fat these days—I’ve heard that fat is somehow good now, and can help with weight loss and disease prevention. How can that be true, when for decades we all were told that fat was the bad guy?”
That’s a recent question I received and it came at the perfect time. I’ve just finished writing my new book Eat Fat, Get Thin, which hits bookstore shelves on February 23. I wrote this book because almost everyone I know—doctors, patients, and eaters alike—are all confused about fat and still hold on to myths and misinformation that prevents them from taking advantage of the latest science to lose weight and get healthy (1).
You’re likely familiar with many of them: Fat makes us gain weight, contributes to heart disease, and leads to “diabesity.” Saturated fat is bad—vegetable oils are good. I could go on, but I think you know what I’m talking about.
None of these beliefs about fat are true. In my latest book, I combined the latest research with my several decades of empirical evidence working with patients to prove what I’ve long discovered: The right fats can help you become lean, healthy, and vibrant (2).
Fat is one of the body’s most basic building blocks. The average person is made up of between 15 and 30 percent fat! Yet for decades, we’ve unfairly demonized dietary fat, diligently followed a low-fat diet that almost always equates into a high-sugar and high-refined carb diet that may contribute to insulin resistance, obesity, heart disease, type 2 diabetes, and numerous other problems (3).
Simply put: Sugar, not fat, is the real villain that steals our health and sabotages our waistlines (4).
With Eat Fat, Get Thin, I’m determined to separate fat from fiction by giving you the skinny on fats: what to eat and how to use dietary fats to regain your health and ideal body weight.
I’m going to blow up the myths about dietary fat and show you how this still-maligned macronutrient can help you become lean and healthy.
For now, let’s look at 10 take-home fat facts.
The average American eats 152 pounds of sugar and 146 pounds of flour (which converts into sugar) every year (5). That’s nearly a pound of sugar and flour combined every day! More sugar means your cells become numb to insulin’s “call.” Your body pumps out more and more insulin to pull your blood sugar levels back down (6). You can’t burn all the sugar you eat. Inevitably, your body stores it as fat, creating insulin resistance and overall metabolic havoc among other mayhem (7).
There are some 257 names for sugar, but despite very minor variations, sugar is sugar is sugar—it all wreaks havoc on your health (8). Fat is more complex. We have saturated, monounsaturated, polyunsaturated, and even trans fats, not to mention subcategories within each group. Some fats are good; others neutral; and yes, a few are bad (9).
When people eat less fat, they tend to eat more starch or sugar instead, and this actually increases their levels of the small, dense cholesterol that causes heart attacks (10). In fact, studies show 75 percent of people who end up in the emergency room with a heart attack have normal overall cholesterol levels (11). But what they do have is pre-diabetes or type 2 diabetes.
A review of all the research on saturated fat published in the American Journal of Clinical Nutrition found no correlation between saturated fat and heart disease (12). As with all fats, quality becomes key here. The fats in a fast-food bacon cheeseburger will have an entirely different effect than coconut oil. Let’s stop classifying it all as the same.
They include trans fat and inflammatory vegetable oils. Unfortunately, these fats have increased in our diet as they make us fatter and contribute to inflammation, which plays a role in nearly every chronic disease on the planet (13).
About 99 percent of Americans are deficient in these critical fats (14). Ideal ways to get them include eating wild or sustainably raised cold-water fish (at least two servings weekly), buying omega-3 rich eggs, and taking an omega-3 supplement twice a day with breakfast and dinner (one that contains 500 to 1,000 milligrams of omega-3 fats, a ratio of roughly 300 EPA to 200 DHA, is ideal). You’ll find several quality professional omega 3 supplements in my store.
Healthy cell walls made from high-quality fats are better able to metabolize insulin, which keeps blood sugar regulated (15). Without proper blood-sugar control, the body stores fat for a rainy day. The right fats increase fat burning, cut your hunger, and reduce fat storage, and help you lose weight—while eating excess sugar and the wrong types of fat makes you fat (16).
I have many diabetic patients whose health improves when I get them on diet that’s higher in fat. I had one patient with high cholesterol who could not lose weight, so I bumped up her healthy fat content to 70 percent. (I don’t recommend this for most patients; hers was an extreme case.) Her cholesterol plummeting from 300 to 190, her triglycerides dropped 200 points, and she lost 20 stubborn pounds that she couldn’t ever lose before!
Of that percentage, the biggest portion comes from the omega-3 fat called docosahexaenoic acid (DHA) (17). Your brain needs DHA to spark communication between cells. Easy access to high-quality fat boosts cognition, happiness, learning, and memory. In contrast, studies link a deficiency of omega-3 fatty acids to depression, anxiety, bipolar disorder, and schizophrenia (18).
The higher-quality the fat, the better your body will function (19). That’s because the body uses the fat you eat to build cell walls. You have more than 10 trillion cells in your body, and every single one of them needs high-quality fat. How do you know if your cells are getting the fats they need? Your body sends signals when it’s not getting enough good fats, including:
I eat fat with every meal, and I’ve never felt better. The right fats can improve your mood, skin, hair, and nails, while protecting you against type 2 diabetes, dementia, cancer, and much more (20).
My favorite sources of fat include:
Want to learn more? Check out my Q&A video, in which I answer questions about fat, including:
Photo credit: Paul Delmont
Mark Hyman, MD, believes that we all deserve a life of vitality—and that we have the potential to create it for ourselves. That’s why he is dedicated to tackling the root causes of chronic disease by harnessing the power of Functional Medicine to transform healthcare. Dr. Hyman is a practicing family physician, an eight-time #1 New York Times bestselling author, and an internationally recognized leader, speaker, educator, and advocate in his field. He is the Director the Cleveland Clinic Center for Functional Medicine. He is also the founder and medical director of The UltraWellness Center, chairman of the board of the Institute for Functional Medicine, a medical editor of The Huffington Post, and was a regular medical contributor on many television shows including CBS This Morning, Today Show, CNN, and The View, Katie and The Dr. Oz Show.
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