[–] pepepepepe 0 points 0 points (+0|-0) ago  (edited ago)

I'll quote Simple Science Fitness on carbohydrate sources. Take a look because they provide scientific papers to support all their claims here.

The Good

Carbohydrate sources such as fruits and vegetables are very dense in vitamins and fiber. Carbs are also the body's preferred source of energy other than alcohol, especially for anaerobic and long-duration exercise.

Starchy complex carbohydrate sources such as potatoes and long-grain rice help replenish muscle glycogen stores. Muscle glycogen is used as fuel and depletes during strenuous exercise. Starchy foods also contain resistant starch, which resists digestion, functioning similarly to fiber. It is satiating and promotes healthy gut microbiota.

Fiber helps keep you feel fuller longer, reduce appetite, and thus helps you consume less food. It also improves gastrointestinal health and reduces disease and blood pressure.

The Bad

Refined carbohydrate sources such as sugar and wheat- and corn-based products induce appetite cravings and contributes to body fat gains, cardiovascular disease, higher LDL cholesterol, higher triglycerides, and lowering HDL (good) cholesterol. Overconsumption of refined carbohydrates in combination with fats are the driving forces for the obesity epidemic.

They have negative effects and they're not very nutritious so you should limit them as much as possible, but as long as you're within your calorie range and macro ratio it shouldn't be a big deal every once in a while.