My guess is initially the diet..which as some point levels out. While adding muscle mass ..initially..slowed weight loss..and later speeded up weight loss.
Not a nutritionist..but I believe he will have to stick with a modified diet..maybe walking for as long as he wishes to maintain his overall condition.
Or, he might end up in the worse shape then when he started.
Yeah, I agree. The diet comes first and as weight comes off the physical activity comes easier.
I agree with most posters here. Dietary factors are like 85% of the weight loss equation. I’ve chosen to ignore the pound counting and just shoot for health. Good blood work and other indicators.