Inside our bodies is even more unfamiliar. Not being sick does not mean being well. Women are more critical than men of their own bodies. However there is a growing trend among men to be more critical. Men tend to look from their waist to their shoulders - they should go from narrow to wide, not wide to narrow.
Women tend to look at their hips, butt and thighs first.
Women who were underweight were more apt to consider themselves normal. This is not healthy and even dangerous. Culture and society tell us what we are supposed to look like. Weight was a benefit of wealth. Paleness was also an aristocratic privilege, and considered attractive.