5:2 Diet

Popular intermittent fasting diet. It was popularized by British journalist Michael Mosley.
https://www.healthline.com/nutrition/the-5-2-diet-guide
https://thefastdiet.co.uk/how-many-calories-on-a-non-fast-day/
https://thefastdiet.co.uk/forums/
https://www.leancuisine.com/category/meatless
It's called the 5:2 diet because five days of the week are normal eating days, while the other two restrict calories to 500–600 per day.

I will try the following on my fasting days (Tuesday/Thursday):
Breakfast: skim yoghurt 70 calories
Lunch: Subway veggie delight 230 calories
Dinner: Vegetarian lean cuisine 300 calories

On non-fasting days exercise: High Intensity Interval Training (HIIT):

https://darebee.com/pdf/programs/30-days-of-hiit.pdf