Limiting your intake of carbohydrates has a lot of benefits, including weight loss and prevention, and/or improvement of health conditions like diabetes, heart disease and high blood pressure (1). Carbs come in two types: simple and complex. Simple carbs emit bursts of sugar (glucose) when you eat them and then result in a crashy, tired feeling a little later. Complex carbs digest more slowly and contain more nutrients and fiber. The rich fiber found in complex carbs helps you to feel more full. That is why you feel more full after having whole wheat toast compared to eating a sugary donut (2). There is a lot of focus right now on low carb and high fat diets for weight loss and health, but eliminating complex carbs can rec havoc on your gut (3). As you see, it's not as simple as just "avoid carbs" — like everything in life, it's more complicated.