The food in restaurants usually has the following drawbacks: too oily, too salty, and too many condiments, all of which lead to a bitter or sticky mouth, eye secretions, thirst, and sometimes mouth blisters.

I often think about things I might do afteronce I retire.

It makes more sense, since you are talking about immediately when you retire as opposed to in a far off distant future post-retirement.

I planthink I would need to spend two to three years traveling to get the most out of it.

Combine the below sentence with this one. It doesn't have to be like what I wrote verbatim.

I think I will need that much time.

I would remove this sentence and adjoin it to the above sentence.

I sometimes eat out, but I am notever/rarely satisfied with those restaurants and often feel unwell after eating there.

Same thing, combine the next sentence with this one. What you wrote isn't wrong, but it just flows better.

I often feel unwell after eating at them.

TI often find the food in restaurants usually has the following drawbacks:to be too oily, too salty, and to contain too many condiments, all of which lead to having a bitter or sticky mouth, eye secretions, thirst, and sometimes, mouth blisters.

You don't always need to use a colon when listing. I sometimes find it can flow better without one.

No exaggeration, iIt is very harddifficult to find a restaurant where the food is both natural and fresh, and where we won’ton't leave you feeling uncomfortable even after eating there several times in a row.

Again, what you wrote isn't necessarily wrong. Your English is really good! I am changing some things to flow better and to use bigger/better words.

My homemade food is much better than restaurant food, because we cook it using less oil, salt, and without condiments.

Same things, too many small sentences make writing sound choppy. Sometimes it helps to combine sentences.

We always cook food simply, using less oil, less salt, and no condiments.

Combine with the above sentence.

WThe only add green onions, ginger, or garlic to our dishesthings we add to our dishes are green onions, ginger, and sometimes, garlic.

Since this

IUnfortunately, I haven't sbeems I can’tn able to find a restaurant that cooks food this way in my city.

That is why I might run a small restaurant.

You don't need this sentence.

I want my cooking philosophy to benefit more people, allowing them to eat natural, fresh, and nutritious food.