A sick day on a GLP-1 is different from a normal sick day: appetite is already low, dehydration risk is higher, and the drug's slowed digestion makes heavy sick-day comfort foods (soup with cream, toast with butter) worse. The sick-day plan is small, bland, hydrating — and knowing when illness plus the drug needs medical input.
Illness plus a GLP-1 stacks appetite loss, dehydration risk and slowed digestion. Hydration and minimal, gentle food carry most people through.
Small, bland and hydrating: broth, rice, bananas, toast, applesauce. Skip creamy and heavy comfort foods — the slowed stomach handles them badly, and the illness already has you dehydrated.
Do not decide this alone — missed or doubled doses are a provider conversation. Focus the food side on hydration and small bland meals, and tell your provider about the illness.
If you cannot keep fluids down for 24 hours, have a high fever with vomiting, or feel severely dehydrated, contact your healthcare provider — illness plus a GLP-1 raises the stakes on dehydration.
Inability to keep fluids down, high fever with vomiting, or severe dehydration — contact your healthcare provider.
This guide presents USDA nutrition data and the diet framework from the JAMA 2025 patient guidance and 2026 European obesity nutrition consensus for informational purposes only. It is not medical advice. If you are concerned about any symptom, contact your healthcare provider.