Fruits. Low-Carb Fruits. So how about fruit? As you can see, all fruits contain quite a few carbs (mostly in the form of sugar). That's why fruits are sweet! Fruit is. After all, don't fruits and veggies contain a lot of sugar and carbs? Some low-carb diets specifically say to avoid fruit, at least for a certain part Introduction · Low-carb fruits · Low-carb vegetables. Fruit tends to have a higher carbohydrate content than most vegetables, because of the naturally occurring sugars - they're sweeter, after all.