Fatness n. : The quality or state of being fat, plump, or full-fed; corpulency; fullness of flesh.

Fatness n. : Hence; Richness; fertility; fruitfulness.

Fatness n. : That which makes fat or fertile.

Example:
how to reduce Fatness from different parts of body ?

Taxonomy
obesity, BMI, weight loss, body fat, calories, leptin, risk, diet, exercise, adults, Body fat percentage, mortality, United States, overweight, physical activity, complications, body mass index, Childhood obesity.

Defination from the web:
... Validity of body mass index compared with other body-composition screening indexes for the assessment of body fatness in children and adolescents" ...