> It is physically impossible to gain organic mass if you don't consume a calorie surplus. Likewise it is physically impossible to maintain organic mass if you

> It is physically impossible to gain organic mass if you don't consume a calorie surplus. Likewise it is physically impossible to maintain organic mass if you consume at a calorie deficit. > Is it common for people to be force-fed as an adult? If not, then am I being obtuse by suggesting these things are absolutely within an adults control? Sadly, hunger response isn't strictly proportional to caloric intake, but to a multitude of factors (blood sugar levels, stomach content, thyroidal hormones). So you might feel hungry while not requiring the extra calories. It's also why gastric bypass works. It's relatively easy for 200 extra calories a day to sneak-in someone's diet without them really noticing. Over time it adds-up. But it's totally under one's control (provided they understand basic nutrition).