Raspberries are always a great addition to smoothies. These brilliant berries are also s’blended weight-loss foods. Anthocyanin pigments and flavonoid rheosmin (aka raspberry ketone) rev up metabolism and block fat absorption, while tiliroside (another flavonoid) moderates starch digestion to regulate blood sugar. Raspberries are also loaded with antioxidant and anti-inflammatory agents, and they’re rich in vitamins, minerals, and fiber. The best part is that they’re relatively low in natural sugar (as fruits go) and low in fat.