EpistemisWeight gain due to endocrine etiology
Specialty: Endocrine and metabolic.
Why it occurs
- Severe primary hypothyroidism (thyroid hormone deficiency drastically slows basal mitochondrial oxidative metabolism and causes accumulation of hydrophilic mucopolysaccharides in the interstitial space that retain water and sodium)
- Cushing syndrome (chronic excess of cortisol favors the differentiation of preadipocytes to adipocytes in the visceral and central territory, promoting central lipogenesis)
- Polycystic ovary syndrome (insulin resistance with compensatory hyperinsulinemia decreases hepatic lipolysis and promotes lipid storage)
- Insulinoma (recurrent episodes of hypoglycemia induce excessive and continuous defensive caloric intake to avoid neuroglycopenic symptoms)
- Monogenic leptin deficiency or melanocortin 4 receptor (MC4R) mutation (innate alteration in hypothalamic satiety signaling pathways, producing massive hyperphagia and early-onset obesity)
Initial workup
Thyroid profile with ultraprecision TSH and free T4; 24-hour urinary free cortisol and nocturnal dexamethasone suppression test (1 mg); glucose and fasting plasma insulin levels to calculate the HOMA-IR index; complete lipid profile; glycosylated hemoglobin (HbA1c); serum prolactin (hyperprolactinemia reduces hypothalamic dopaminergic tone and promotes weight gain); and transvaginal ultrasound if there is clinical suspicion of PCOS.
red flags
Massive weight gain in a few months associated with severe progressive proximal muscle weakness (manifest difficulty getting up from the toilet or climbing stairs), severe diastolic arterial hypertension of recent onset, extreme affective changes of manic-depressive type or frank psychotic outbreak, uncontrollable daytime somnolence with refractory morning headache, or oliguria with marked generalized edema.
Standard management
- Levothyroxine sodium — specific replacement treatment of choice to restore euthyroidism, with progressive dose titration monitoring cardiovascular status, which reverses myxedema and normalizes basal energy expenditure
- Liraglutide — GLP-1 receptor agonist that increases satiety at a central level, slows gastric emptying and improves insulin sensitivity, useful in prediabetes and severe insulin resistance
- Metformin — biguanide indicated in patients with weight gain associated with PCOS and severe insulin resistance
- Cabergoline — in cases where weight gain is secondary to tumor hyperprolactinemia
Educational guidance for study. It is NOT a prescription recommendation. The actual choice depends on the cause, the patient, and current guidelines.
- Area
- Endocrine and metabolic
- Listed causes
- 5
- Treatment options
- 4