As if this wasn't reason enough to start drinking acai smoothies for lunch, these berries are also packed with antioxidants -- nature's compounds that disarm and obliterate the free radicals that harm cells and lead to disease and deterioration. Acai berries are ranked as the highest source of antioxidants of any food, with 10 times the amount of grapes and twice the amount of blueberries.

Acai has a particularly high concentration of anthocyanins, which are an antioxidant in the flavonoid family of phytochemicals. Anthocyanins are powerful chemicals, working to slow the aging process, prevent cancer and improve skin cells. Cyanidin-3 glucoside, the anthocyanin present in acai berries, is three times stronger than the anthocyanin found in red wine.

Acai berries also supply a range of beneficial nutrients. They boast a strong vitamin and mineral content, with as much calcium as milk per serving, and commendable amounts of iron, folate, magnesium, potassium and vitamins B, C, D and E. Acai pulp is also extremely fibrous, making it a good source of soluble fiber, which helps rid the body of toxins and waste.

Many proponents of acai love the fruit for its energy supply. Rich in amino acids, acai is traditionally used for endurance, strength and sustained energy. One of its phytochemicals is a natural stimulant - theobromine. This compound stimulates oxygen flow, which increases the body's energy efficiency. It is this same chemical that gives acai its label as a weight-loss supplement. Theobromine not only increases energy, but it also suppresses appetite. Acai berries are a safe, nutritious way to help lose weight.