Lemon, a popular citrus fruit rich in Vitamin C, vitamin B, riboflavin and minerals like magnesium, calcium and phosphorous helps you to lose weight. The fruit contains carbohydrates and proteins. Lemon can be used to make lemon water and consumed any number of times during the day. It aids weight loss. An adult should consume anywhere between 60 to 80 mg of Vitamin C a day and one lemon fruit contains 44.5 g of vitamin C. Vitamin C plays an important role in regulating insulin levels helps support carbohydrate metabolization which curbs cravings for food. The Vitamin B helps aid digestion while Vitamin B12 converts fat into carbohydrates. Lemon water helps to rid the body of toxins and thus aid weight loss.