“....that does not explain why average people support unhealthy children.” You said it right there: AVERAGE people. Same kind of people who do the bare minimum in everything are used to settling for “average.” Most exceptional people expect to work for anything they want, so they usually get what they want in life, as average people look on in frustration and contempt. Besides people with legit medical issues that negatively affect any diet and exercise regimen they try, the rest of the dialogue surrounding this segment is usually rationalizing someone’s laziness, lack of commitment, and/or lack of discipline. Simply put: Average.