Load up on energy with these low cal boosters. Ginseng tea Known for centuries as an antioxidant cure-all, ginseng is also a stimulant which provides increased energy and concentration. It's difficult to find dried ginseng, never mind fresh, so we recommend getting your fill of this ancient root through a cup of ginseng tea. Its warmth will have a calming effect on your nerves while simultaneously giving you the energy to power through any late-night task. Bananas Boasting three naturally-occurring sugars - sucrose, fructose, and glucose - bananas are an obvious choice for a quick energy boost. But don't let all that sugar fool you into thinking the fix is only temporary. Bananas also contain fibre, which will help sustain the glucose levels in your blood, thus giving you a steady source of energy over a longer period of time. Aged cheese Unlike their soft, younger counterparts, aged cheeses contain high levels of the amino acid tyramine - known for its ability to encourage the secretion of stimulant hormones in the body. So, the next time you need a boost, try a piece of Parmesan, Stilton, or any other hard cheese. Beware of eating them in excess, though. Strawberries Strawberries are a great, low-cal addition to a healthy lifestyle, packing enough vitamin C, manganese, and fibre for a 'berry' nutritional punch. One serving of strawberries - about eight medium strawberries - is high in fibre and an excellent source of vitamin C. The star player in strawberries is vitamin C, an antioxidant that helps repair the body's tissues, boosts immunity, and fights excess free radical damage. Wheatgrass Wheatgrass is chock full of nutrients. In fact, it contains 25 times the nutrients of vegetables. Many people drink shots of wheatgrass juice as a general health booster. Wheatgrass juice which contains chlorophyll, minerals, and vitamins A, B-complex, C, E, and K, protein and 17 amino acids is easily absorbed in human blood.