A great source of calcium and important cancer-fighting compounds, broccoli also has loads of filling fiber and will set you back only 30 calories per serving. If eating this cruciferous veggie makes you bloat, try steaming it first, which makes it easier to digest while still preserving the cancer-fighting ingredients that could be lost when you boil or cook it in the microwave.
On top of its 4 grams of belly-filling fiber, a cup of hearty oatmeal delivers as much protein as an egg. In other words, the popular breakfast food is an excellent weight loss tool. In fact, according to a study in the Annals of Nutrition and Metabolism, scientists found that having oatmeal for breakfast resulted in greater fullness, lower hunger ratings, and fewer calories eaten at the next meal compared with a serving of ready-to-eat sugared corn flakes, even though the calorie counts of the two breakfasts were identical. For ways to get more fiber, sprinkle some berries and chia seeds on top of your oatmeal, but be sure to stay away from fattening syrup and sugar.
These foods—notably vegetables, fruits, legumes, and whole grains—should supply about 20 to 35 grams of dietary fiber a day, depending on your calorie needs. (Aim for 14 grams of fiber for every 1,000 calories, as advised by the Dietary Guidelines for Americans.) Fiber slows the absorption of carbohydrates, so they have less effect on insulin and blood sugar, and it provides other health benefits. Try to fill three-quarters of your plate with produce, legumes, and whole grains—leaving only one-quarter for meat, poultry, or other protein sources.
Craving something sweet? Instead of fattening cookies or cake, reach for fresh figs. Thanks to their dense consistency and high amount of filling fiber, they can slow the release of sugar into your blood. Pair with ricotta cheese, melons, and prosciutto to make a satisfying fruit salad, or use as a topping on whole-wheat pizza with crumbled feta and walnuts.
A fat-burning superfood, grapefruit contains a compound that can lower the fat-storage hormone insulin, which in turn can lead to weight loss. In fact, eating half a grapefruit before each meal could help you lose up to a pound a week—even if you don't change anything else about your diet. Because grapefruits are 90% water, which fills you up, they also act as a natural appetite suppressant.
Popular diets, often referred to as fad diets, make promises of weight loss or other health advantages such as longer life without backing by solid science, and in many cases are characterized by highly restrictive or unusual food choices.:296 Celebrity endorsements (including celebrity doctors) are frequently associated with popular diets, and the individuals who develop and promote these programs often profit handsomely.:11–12