To eat well on GLP-1 treatment, tell your clinical team if the medicine makes eating or drinking enough hard. A smaller appetite is no reason to ignore nourishment. Food and ongoing support matter alongside the medicine. Ask about a dietitian referral or practical food advice, and bring notes on your meals, fluids and symptoms.
Dietitian and food support on weight-loss medicine
Ask whether your pharmacy offers a dietitian referral, practical food advice or follow-up when eating gets hard. Food and ongoing support matter alongside the medicine.
Guy’s and St Thomas’ publishes dietary advice for people taking weight-loss medicines. The advice stresses building eating habits you can keep up as part of treatment. Your own advice may need to allow for medical conditions, food preferences and symptoms. No general guide can set the right calorie or protein target for every person.
What to note before a nutrition appointment
- Meals and fluids: whether you manage regular meals and drinks.
- Symptoms: any nausea, vomiting, constipation or other symptoms affecting eating.
- Triggers: foods or situations which seem to cause discomfort.
- Energy: changes in energy, strength or your ability to do everyday tasks.
- Health needs: any existing conditions or dietary restrictions.
These notes start a conversation. They are not a diagnosis. Do not follow a highly restrictive diet to speed up the effect of treatment.
When to get help for eating problems on GLP-1 treatment
Get medical advice promptly if you cannot keep fluids down, feel more and more unwell or have signs of dehydration. Do not dismiss persistent symptoms as proof the medicine is working.
If worries about weight, food or body image cause you distress, tell your clinician. The NHS describes support options for weight management and related health needs. Medicine is one part of care.
Compare nutrition support when you switch pharmacy
Ask what support is included, how you get the support and whether it stays available between orders. If you have a nutrition plan which helps, bring the plan to the new consultation. Explain what works and what does not. Good care with no gap covers support as well as the medicine.
If you switch pharmacy every month to pay a new-customer price, ask each new pharmacy these questions.
Frequently asked questions
What should I do if I cannot eat enough on GLP-1 treatment?
Tell your clinical team if GLP-1 treatment makes eating or drinking enough hard. Ask whether your pharmacy offers a dietitian referral, practical food advice or follow-up. A smaller appetite is no reason to ignore nourishment.
When should I get medical advice for sickness on GLP-1 treatment?
Get medical advice promptly if you cannot keep fluids down, feel more and more unwell or have signs of dehydration. Persistent symptoms on GLP-1 treatment are not proof the medicine is working.
Should I diet hard to make GLP-1 medicine work faster?
No. Do not follow a highly restrictive diet to speed up GLP-1 treatment. No general guide can set the right calorie or protein target for every person, so ask your pharmacy about a dietitian referral.
What nutrition support should I ask about when switching pharmacy?
Ask the new pharmacy what nutrition support is included, how you get the support and whether it stays available between orders. Bring any existing nutrition plan to the new consultation and explain what works for you.
Sources
Links checked on 6 October 2026. Provider prices and policies change, so confirm the details with the provider before you pay. The organisations linked here have not reviewed or endorsed this guide.
- Guy’s and St Thomas’: dietary advice for people taking weight-loss medicines
- NHS: dehydration
- NHS: overweight and obesity in adults
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