3. Weight Gain
Excessive sugar consumption makes you gain weight. Of course, other factors like activity level and metabolic rate play a role, but the body burns sugar for energy first. What it cannot use immediately, it stores as fat.
Furthermore, eating too much sugar makes you overeat by suppressing the hormone leptin, which tells the body when to stop eating. If you feel tired and lethargic after consuming sugar, you are also less inclined to exercise.
