Eating one big meal a day is not why you are skinny. That is due to the calories you consume and are able to absorb. You can be healthy skinny eating three meals a day. I am surprised you do not have a distended liver from 'famine syndrome' The body can only use 'active' food for about 7 or 8 hours. After that, it has to start pulling calories from the liver. When meals are far apart, the body starts storing more food in the liver and using less for active needs.

Why do you have a glucometer ?

When I was not eating right, my mood and cognitive skills roller coastered through the day. My diet was a donut and milk for breakfast then a late dinner. My doc said I was cycling wildly because of the sugar in response to famine.

Based on your condition, you are not achieving any health benefits of being skinny. Health benefits come more from what you eat than how much you don't eat or how skinny you are. Society has it wrong. Dr Oz has it wrong.

If you can eat one healthy meal, save half of it for your next meal.

Jelly legs is a good sign of low blood sugar.