Re: I want to reduce 10kg in 3 months - need advice for diet plan?
What is normal diet to you? How are you eating differently while trying to lose weight?
You don’t have to go back to eating larger or unhealthier portions after you achieve your goal, infact once you get your stomach to shrink by eating smaller/healthier portions, it’ll be a task for your stomach to capacitate more food. Whatever you train your stomach to do is what it should be doing even when you want to eat normally as you call it.
Hope that makes sense. 
This is the reason they call eating healthy is/has to be a lifestyle change.