How fast does the body convert excess calories to fat?

Question

Assuming I eat exactly my TDEE everyday, on day I have a big meal and consume an extra 200 calories over my TDEE. How long do I have to create a calorie defecit of 200 calories before they’re stored as fat by my body?

In: 672

Answer 1

According to a 2012 study at Oxford University, it can take as little as four hours for excess calories to be converted into fat.

The first thousand-ish calories are converted into glycogen, which gets broken down for energy over time. If you eat more than that in one sitting, or if you eat when your glycogen stores are already full, the excess calories get converted into fat.