A Harvard professor’s new book, "Fed Up," tests out popular diets

Key Points:

• Many popular diets focus on eliminating entire food groups, but science shows that diet-health relationships are complex, with foods having both benefits and risks depending on individual factors like genetics and lifestyle.
• Weight loss is challenging due to evolved biological mechanisms that increase hunger and fat storage after dieting, but GLP-1 drugs can help suppress appetite, though hunger returns after stopping the medication.
• Most diets fall into low-calorie, low-fat, or low-carb categories, each with pros and cons; traditional minimally processed, mostly plant-based diets combining whole grains, legumes, vegetables, fruits, nuts, and modest animal foods tend to offer balanced nutrition and better long-term weight maintenance.
• Long-term weight management is supported by eating fiber-rich plant foods, limiting processed junk foods, regular home cooking, portion control, consistent self-weighing, and physical activity, with diet and exercise working synergistically for health.
• To reduce chronic disease risk, favor diets low in added sugar, high in unprocessed fruits and vegetables, unrefined grains, legumes, nuts, mostly unsaturated fats, moderate seafood, limited red and processed meats, and minimal salt and chemical additives, aligning with traditional nonindustrial dietary patterns worldwide.