Spinach is also a great source of folate, dietary fibre, vitamins A, B, C, E and K3. CauliflowerThe floret is a storehouse of vital minerals and nutrients. The superfood is also loaded with, protein, magnesium, phosphorous, potassium and manganese. The GI of cauliflower is calculated to be between 5 to 15, which is ideal for people with diabetes. Cauliflower also has high-fibre content which is further beneficial to check blood sugar fluctuations.