Not so sure about becoming a vegetarian or vegan? That's where the flexitarian diet comes in. You're basically adding new foods into your diet, focusing on plant-based proteins like tofu, beans, nut or soy milk, and eating less meat — but not cutting it out completely. Since vegetarian and vegan diets typically lead to weight loss, you'll see results from being a flexitarian, too: Studies show those who are mostly vegetarian or vegan have a lower BMI than full-on meat-eaters.
I love this study because it examined a realistic lifestyle change rather than just a fad diet. Both groups, after all, were labeled as healthy diets, and they were, because study investigators encouraged eating high-quality, nutritious whole foods, unlimited vegetables, and avoiding flours, sugars, bad fats, and processed foods. Everyone was encouraged to be physically active at a level most Americans are not. And — this is a big one — everyone had access to basic behavioral counseling aimed at reducing emotional eating.