In the future, do not skip lunch. Whether intentional or not, this is a bad, bad move. Especially when you go grocery shopping and then stop by your sister’s chinese restaurant to drop off some supplies. The buffet is not a good idea. It is not your friend. Even when you think you make good choices, you don’t. You’re not in control of what ingredients are in the food.
That being said, you should still be okay. You didn’t eat much so forgive yourself. But don’t do it again. You’ll feel better about it. I promise.