Feeling full earlier than usual can be one of the more noticeable changes after starting a GLP-1 medicine. It can show up as leaving food on the plate, losing interest partway through a meal, or finding that a meal that once felt ordinary now feels too large. A brief record can make that change easier to describe at a review appointment without trying to turn every meal into a test.
Start with the part that is easiest to remember: how hungry you felt before eating, when you first felt comfortably full, and whether you stopped because you felt satisfied, nauseated, uncomfortable, or simply not interested in more food. A simple note such as "hungry at lunch, comfortably full halfway through, no nausea" is often more useful than trying to calculate every bite.
Over a week or two, add context only where it changes the picture. Note the time of the meal, whether it was close to an injection day, whether you ate at your usual time, and any symptoms that came with the fullness. This can help separate a consistent pattern of earlier satiety from a day affected by nausea, constipation, stress, illness, or an unusual routine.
It is also worth recording the practical effect. Were you still able to drink normally? Did you miss meals because you felt too full, or did your usual meal rhythm simply shift? These are different experiences, and a prescriber can use that distinction when discussing how treatment is going. Your record is not a reason to alter your injections or make assumptions about what you should eat.
Contact your prescriber if fullness, nausea, vomiting, constipation, or diarrhoea is bothering you, not settling, or making it difficult to eat or drink. Seek urgent medical help for severe or rapidly worsening symptoms.