Glucose charges the brain, yeah. Take yo lunch breaks. Don't overdose on it though; you'll get a sugar crash later.

Fruit and veggies are good for this. Sprite Zero may be useless or negative. Be wary of white bread, instant noodles, pasta, potato, chocolate, sweets, any fast sugar (surprisingly sugar itself may be okay).

Isomaltulose was invented to be a good form of this but it's similar in impact to fruits.