Because they aren't taking an appetite suppressing drug. It's easier to not eat when you aren't hungry, so it's easier to lose weight with the same amount of willpower compared to people that aren't taking an appetite suppressing drug. Willpower has no part in the study, it doesn't "suggest the opposite".
Because they aren't taking an appetite suppressing drug. It's easier to not eat when you aren't hungry, so it's easier to lose weight with the same amount of willpower compared to people that aren't taking an appetite suppressing drug. Willpower has no part in the study, it doesn't "suggest the opposite".