For a thorough obesity workup, get the following blood tests: (1)
Thyroid profile â
TSH, Free T3, Free T4 (hypothyroidism is a common hormonal cause of weight gain), (2) Fasting insulin + fasting blood glucose +
HbA1c â to check for insulin resistance and pre-
diabetes, (3)
Lipid profile, (4) Morning serum cortisol â to rule out Cushing's syndrome, (5)
LFT + KFT â general assessment, (6)
Vitamin D and
B12 â commonly deficient in obesity, (7) CBC, and (8)
Prolactin if applicable. For your yo-yo rebound: extreme fasting causes muscle loss and slows your metabolism. When you stop, your body â now with less muscle and a slower metabolic rate â stores fat more aggressively, leading to 'rebound' weight above your starting point. Sustainable changes in diet and activity are far more effective long-term than crash fasting.
Next Steps
Get these tests done and consult a physician or endocrinologist to review results. Focus on gradual, sustainable dietary changes rather than extreme fasting. Please consult me directly on Practo for a detailed evaluation.