Will the hair loss caused by dieting improve if I go back to a regular diet?

They say that once hair loss begins, it is not easy to reverse.

Would the same apply to hair loss caused by dieting?

I am currently on a diet through exercise.

I found that I couldn't lose weight just by exercising.

So, while fasting for about 5 days

I want to lose some weight.

The thing I'm worried about is that I went on a diet last year.

I once quit right away because I felt like I was losing a lot of hair.

I'm worried that it might happen again this time.

If you go back to a regular diet after losing hair due to dieting

Will I be able to return quickly?