Whey protein shakes made with water, not milk as meal replacement?
Thoughts?
Depends. I would say it would be more of a snack depending on calories. I have a protein shake (200 calories) and a piece for fruit post workout for breakfast.
I would recommend trying to stay somewhere around 20% less MAX than your TDEE. Google TDEE calculator to figure out how many calories you burn a day and then subtract 10-20% of that and it gives you a good idea of how many calories you should be shooting for on a daily basis