I can't believe I never asked this before...
If you eat fewer calories the next day but still fulfill the exercise portion of your plan you'll be less effective. If your workout and calorie plan are integrated you are better not to try to compensate by lowering the calories the next day.
If I've over eaten I try to increase the exercise that day as well. If I've fallen and eaten junk to overeat rather than fresh whole foods, I'll eat something else too, like turkey balls or a shake, and then up the intensity of my exercise.
If you've overeaten one day, then just don't worry about it. Don't try to overcompensate by overtraining. You can cause injury and that would definitely hold your back. Just forget about it. Start over the next day. Make sure your follow your meal and be consistent. Consistency is really the key. One bad day of overeating isn't going to hurt you if you remain consistent. Just don't make it a habit. Every day is a new day. Focus on your goal and work consistently towards it.
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