In addition, experts say that acai berries are rich in antioxidants, which help the body to fight free radicals. In fact, the Mayo Clinic says that acai berries may contain even more antioxidants than other berries. They are also said to be high in fiber and good fats.

That said, research is limited in the actual benefits of acai berries. But time is sure to reveal new and exciting secrets about this fruit.

2.    Blueberries

Blueberries may offer preventative and combative effects when it comes to cancer. A relatively recent study in mice showed that a polysaccharide (BBP3-1) found in blueberries may inhibit the growth of tumors. Study authors concluded that the polysaccharide inhibited the rate of tumor growth by 73.4 percent. Another study analyzed the effects of blueberry extracts on melanoma.  Researchers found that these extracts could potentially be used as a chemopreventive or adjuvant treatment for metastasis control.

Other studies indicate that blueberries may be helpful in the treatment of prediabetes. Obese rats were given either a high fat or low fat diet including blueberry powder or added sugars. Among the numerous health benefits found, study authors say that the rats that consumed the higher fat diet and blueberry substance were found to have both reduced triglycerides and fasting insulin. In addition, they had a lowered amount of abdominal fat.  Other studies indicate that blueberries can improve insulin sensitivity in obese, nondiabetic, and insulin-resistant humans. So when it comes to preventing diabetes, blueberries are a go-to method of protection.

Blueberries may also provide cardiovascular benefits. One study shows that blueberries can improve diastolic blood pressure (the bottom number). Another study found that a combination of blueberries and strawberries decreases the risk of heart attack in young and middle-aged women.