Especially,The main problem was that overeating would interfere with my daily exercise.

“Especially” is used more to emphasise a previous statement. So here especially would emphasise the amount of time you used to take with choosing and eating food, but this meaning isn’t expressed in your sentence so I thought something like “the main problem was” might be better

So I adjusted my eating habits: I ate as much as I liked at breakfast but only kept away from hungerthese behaviours at lunch and dinner.

“Kept away from hunger” implies something along the lines of not being hungry at lunch and dinner, or at least that’s how I interpreted it when I read it.

That's how I found time to come here to write in English and to run at night.

Both make sense though

But there were two or three days a week that I couldn't do that because I needed to have dinner with my family and friends.

If this is still the case then you could say “but there are two or three days a week that I can’t do that because I need to have dinner with my family and friends”

I went back to being a foodie ion those days.

If the previous alternative sentence is used then “I go back to being a foodie on those days.” Note: I think “these” would also work instead of “those”

I'm trying not to be a foodieone of those foodies who takes pictures of food every day.

As you may know, there are many great restaurants in Shanghai, and the delivery system in the city is well-developed in this city, thus I can almost, so I can pretty much get any kind of cuisine I want delivered in 30 minutes.

EspeciallyIn particular, overeating would interfere with my daily exercise.

So I adjusted my eating habits: I ate as much as I liked at breakfast but only kept away from hungerate just enough to be full at lunch and dinner.

That's how I found time to come here to, write ian English entry, and tgo run at nightfor an evening run.

Those days, I went back to being a foodie in those days.

I'm trying not toALSO POSSIBLE: I'm trying to avoiding too much be a foodie every day.

MY GUESS: Especially, overeating wouldstarted to interfere with my daily exercise. routine.

CLEARER: So I adjusted my eating habits: I ate as much as I liked at breakfast, but only kept away from hungerwas sparse at lunch and dinner.

But there were如果目前情况属实，我建议使用以下措辞： But two or three days a week I couldan't do that because I needed to have dinner with my family and friends.

I went back to beMORE VIVIDLY: I revert to becoming a foodie ion thosesuch days.

I'm trying not to be a foodieovereater every day.

A "foodie" is a person who really likes food and enjoys eating, exploring, and learning about different kinds of cuisine. It also has a positive connotation of enthusiasm and appreciation for food. Since you seem to talk about your eating habits in a negative way, I think "overeater" or "glutton" or "heavy eater" may be a better word to use.

It took me too much time to choose andwhat to eat.

Especially, since overeating would interfere with my daily exercise.

So I adjusted my eating habits: I ate as much as I liked atfor breakfast, but only kept away fromI ate just enough to keep the hunger at bay for lunch and dinner.

But, there weare two or three days a week, I couldn't do that because I needed to have dinner with my family and friends.