I am currently doing one meal a day - mostly low carb. I have struggled with weight loss but this is surprisingly easy. The one meal is standard size with plenty of veggies. I have lost 30 lbs in 10 weeks and feel like I am 17 again.
I was already biking to work daily (15 miles round trip) and do light weights.
For my body chemistry it works far better than anything I have ever tried. But your mileage may vary. And my bloodwork is good too.