This issue depends on the person. Some people have to be really careful with the type of carbs they consume, so you need to experiment. Try various simple and complex carb sources and monitor their effect. If you do not monitor your response to carbs, it may be too late by the time you notice a problem. Keep a ledger of what you eat and how much so that you can make changes. Oatmeal, which digests very slowly, works well. A different carb source may work better for you, so you need to experiment and monitor your results. You may also find what works best today won’t be optimal tomorrow. Vigilance is the key to gains in bodybuilding.