Berries, including blueberries, strawberries, raspberries, and goji berries and acai berries are powerhouses of nutrition. They are packed with vitamins and minerals, and are also some of the best sources of antioxidants. Berries contain a healthy dose of fibre, which slows down your carbohydrate absorption and digestion, and controls blood sugar levels to help prevent insulin spikes. This makes berries a great superfood for fat loss and a leaner body.