Fiber is made up of the parts of plant food that your body can't digest. It is often divided into two groups: soluble and insoluble fiber. Fiber, particularly soluble fiber, can help control blood sugar spikes. It dissolves in water to form a gel-like substance that helps slow the absorption of carbs in the gut. This results in a steady rise and fall in blood sugar, rather than a spike. (24, 25). Often when we over eat sweets we cause insulin spikes - and too much sweets and too many insulin spikes are highly stressful to the system - can lead to type 2 diabetes, weight gain and inflammation.