Calories Drop — By Design
Because the surgery restricts volume and (for bypass/duodenal switch) reduces absorption, your calorie needs fall well below a standard calculator's output. Typical staged ranges:
- Liquid phases: ~300–600 kcal/day
- Soft phase: ~600–800 kcal/day
- Stable phase: ~1000–1200 kcal/day
Why a Regular Calculator Fails
A standard BMR × activity estimate assumes a normal stomach and full absorption. Post-surgery, both are altered, so it overestimates your true needs and can stall loss or cause discomfort.
Our Bariatric Calculator is phase-aware. See post-op diet phases and the Bariatric hub.
Educational only. Your surgical team sets exact targets; these are planning ranges. Lifelong vitamin/mineral supplementation is mandatory.