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Originally Posted by Devils'Advocate
There are none. Studying "lifestyle change" is near impossible because what that means for one person could mean another to someone else. So a study would need to have rigid guidelines which would be hard to ensure that they were following.
I think the REVERSE can be studied. If we look at the National Weight Control Registry of people who have been successful, 100% of them lost and are maintaining by "lifestyle change".
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It would be monitored by medical professionals with the guidance given by doctors. There have been studies and they've been posted in similar threads where weight loss success based on lifestyle changes rather than explicit diets had been measured. I asked EE for the positive studies because the ease he says should be easy to demonstrate. The studies I've seen all point to near impossible.
100% of successful people having to have lifestyle change as a component doesn't mean much if that 100% is only 5% of those that attempted lifestyle change.
Imagine any other condition where the doctor prescribed a solution where only 5% of the population was capable of doing it. If a physio program had only 5% chance of restoring walking they'd be very up front with that. But with obesity doctors just say 'oh just exercise more and eat better' and imply a 100% success rate, not the actual 5%.