| Iatrogenic causes |
| Drugs that cause weight gain |
| Hypothalamic surgery |
| Dietary obesity |
| Infant feeding practices |
| Progressive hyperplastic obesity |
| Frequency of eating |
| High-fat diets |
| Overeating |
| Neuroendocrine obesities |
| Hypothalamic obesity |
| Hypothyroidism |
| Seasonal affective disorder |
| Cushing's syndrome |
| Polycystic ovary syndrome |
| Hypogonadism |
| Growth hormone deficiency |
| Pseudohypoparathyroidism |
| Social and behavioral factors |
| Socioeconomic status |
| Ethnicity |
| Psychological factors |
| Restrained eaters |
| Night eating syndrome |
| Binge eating |
| Sedentary lifestyle |
| Enforced inactivity (postoperative) |
| Aging |
| Genetic (dysmorphic) obesities |
| Autosomal recessive traits |
| Autosomal dominant traits |
| X-linked traits |
| Chromosomal abnormalities |
| Other |
| Low birth weight |
