Hello my friend.
I have read that you want to eat just one meal a day.
But if you eat healthy food you can eat also 2-3 times a day.
It's not important how much you need.
It's more important what you eat.
You must eat low carb.
Dont eat bread or pizza.
Eat lots of meat and a bit of rice and you will see how fast you will reduce your fat.
Good look my friend.
If you need help, just ask