Why Sugar Makes Us Sleepy (And Protein Wakes Us Up)
Sugar Can Enhance Alertness
Sugar is your brain’s preferred fuel source — not table sugar, but glucose, which your body processes from the sugars and carbs you eat. That’s why a glass of OJ or another fruit juice can offer a short-term boost to memory, thinking, and mental ability.
Have too much, though, and memory can be impaired — along with the rest of you. Go easy on the added sugar, as it has been linked to heart disease and other conditions.