4. Body Types Are Not Set in Stone
When Dr. Sheldon put out his theory on body types, he claimed that body types were set in stone before birth. If someone is an endomorph body type in adulthood, they were predisposed to be overweight well before birth. The idea corresponds to ectomorphs and mesomorphs, as well. However, research into the twenty-first century indicates that body types are not set in stone, while genetics certainly play a role. Endomorphs are not doomed to live their entire lives overweight; they can lose weight and become mesomorphs with ideal weight and solid muscle mass (via WebMD). Likewise, ectomorphs are not doomed to live their lives underweight. If they are malnourished due to an eating disorder, they can get the proper treatment and get up to an ideal weight. If they have a thyroid or other metabolic condition, it can get treated (via nasm.org).