A BMI this low with a good appetite and no weight gain since childhood is worth a proper work-up, not just eating more. Conditions like an overactive
thyroid, intestinal parasites, or poor nutrient absorption can all cause exactly this pattern.
Next Steps
Ask your physician for a
thyroid test, a
complete blood count, and a stool or absorption screen before starting any high-calorie diet plan. Once a cause is ruled out, frequent small meals with protein, nuts, dairy and healthy fats help.
Health Tips
See a doctor sooner if you also notice loose motions, excessive sweating, or a racing heartbeat.