Studies have displayed a link between acne and diets that have a high glycemic load. To cut to the chase, diets loaded with refined carbohydrates and sweets like bread, pasta, and soda. Such food items stir up a spike in your blood sugar, releasing hormones that trigger oil production and cause pore-clogging skin cells to shed faster. Studies have also shown that high-sugar diets are one of the leading causes of fine lines and premature aging. This is because they tend to damage collagen and elastin, the connective tissues that keep the skin firm and supple.