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.
According to a study published in Bioscience, Biotechnology, & Biochemistry , consuming apple cider vinegar each day can lead to weight loss, reduced belly fat, waist circumference, and lower blood triglycerides. More specifically, the study of obese Japanese participants found that those who consumed just one tablespoon of ACV over a three-month period lost 2.6 pounds, and those who consumed 2 tablespoons lost 3.7 pounds in the same time frame. Go ahead and toss a tablespoon or two of this calorie, fat, and sugar-free stuff in your next salad dressing, sauce, or smoothie.
Finally decided to venture out for a run? Snack on some beets before you hit the pavement. A study published in the Journal of the Academy of Nutrition and Dietetics found that runners who ate baked beets before a 5K race ran 5 percent faster. Researchers suspect this is because beets are high in nitrates, a natural chemical that increases endurance and lowers blood pressure.