I'm a Harvard-trained oncologist, and I've seen it all when it comes to nutrition advice. The truth is, many popular beliefs about what's good for us are simply myths. Here are six nutrition myths that I wish would disappear, because the answer to a longer, healthier life is actually quite simple: it's about building sustainable habits, not chasing the next fad. Let's dive in!
1. Snacking is Always Bad
The idea that all snacks are bad is a myth. While ultra-processed snacks like chips and cookies are engineered to make you eat more, not all snacks are harmful. Healthy snacks like nuts, fruit, yogurt, hummus, and vegetables provide fiber, protein, and healthy fats that keep you full without spiking your blood sugar. So, go ahead and enjoy a handful of nuts or an apple with your yogurt!
2. More Protein is Always Better
Most Americans already get enough protein. The recommended intake is around 0.75 to 1.0 grams per kilogram of body weight per day. Protein powders are not a solution, as many contain unsafe levels of lead. Instead, focus on whole food sources like beans, lentils, yogurt, and fish. These are safer and more beneficial than supplements or excessive red meat.
3. Fiber Supplements are as Good as Whole Foods
Fiber supplements can't replicate the complex fibers found in whole foods. Only about 7% of American adults meet the recommended fiber intake, and that's a problem. High-fiber diets are linked to a reduced risk of colorectal cancer, Type 2 diabetes, and lower death rates from heart disease. Fruits, vegetables, beans, and whole grains are the best ways to support gut health.
4. Low-Fat Dairy is Always the Best Choice
The idea that higher-fat dairy causes weight gain is a myth. Dairy consumption, regardless of fat content, is associated with a lower risk of Type 2 diabetes and improved growth in children. Studies show that children who consume whole-fat dairy have lower odds of overweight and obesity. So, choose the version you enjoy and can stick to!
5. All Fats are Bad
For decades, we were told that fat makes you fat, but that's proven wrong. Healthy fats like nuts, olive oil, full-fat dairy, and dark chocolate are associated with less weight gain than processed grains and sugary snacks. Liquid plant oils, especially extra-virgin olive oil, have strong evidence of health benefits. Half a tablespoon per day can lower your risk of death by 19% over nearly 30 years!
6. Exercise Can Cancel Out Unhealthy Eating
Many people believe that an extra workout can make up for unhealthy eating, but that's not true. A recent study found that humans burn roughly the same number of calories per day regardless of activity level. Exercise improves health, but it doesn't provide a calorie 'bonus.' What and how much you eat is what truly matters for weight management. However, exercise is still essential for improving sleep, mood, cognition, bone density, and social connection. Walking with others is one of the most accessible and effective forms of exercise.
In summary, good nutrition is about building sustainable habits with whole foods, modest portions, and meals shared with loved ones. Skip the detoxes, keep the olive oil, and enjoy your ice cream occasionally. Remember, it's not about strict rules but about making healthy choices that you can stick to for a longer, healthier life!
