This means switching from 800 calories every day to intermittent fasting, where you will be on 800 calories for a few days a week
How to do it?
Intermittent fasting involves restricting calories to 800 a day on fasting days, then eating a healthy lower carb Mediterranean diet for the rest of the time. This can be much more sustainable and enjoyable than constant calorie restriction, as much of the evidence points at daily calorie counting failing to be sustainable in the long run.
On the days when you are not fasting, you don’t have to count calories, though you will need to be careful about portion control and maintain a healthy Mediterranean-style diet, which the online course will help you do using the meal plans and recipes
Try the 5:2 diet initially, 5 days without calorie counting, eating a balanced Mediterranean style diet and then 2 days counting calories.
At this stage try extending your overnight fast by reducing your TRE window from 12 hours to 10 hours. In other words, making your overnight fast last 14 hours. The reason for doing this is that it will help maintain and enhance the benefits of intermittent fasting, in particular autophagy and ketosis.