What to track on GLP-1: the four things worth writing down

Track four things on a weekly GLP-1: the date and dose of every injection, the site where you injected it, your weight once a week under the same conditions, and one short line about how the week felt. That small record answers almost every question your prescriber will ask — and takes under a minute a week.

The date and dose of every shot#

This is the backbone of the log. Weekly schedules drift — a shot moves from Sunday to Tuesday around a trip away from home, a dose changes at a titration step — and six weeks later nobody remembers which week the change happened. A dated entry with the dose settles it in one glance. During titration it matters most: the FDA labels for weekly semaglutide and tirzepatide set a minimum of four weeks per dose step (checked 2026-08-18), so your prescriber will want the exact date each step started. A titration date planner can lay those earliest label dates out in advance; the log records what actually happened.

Which injection site you used#

The prescribing information for weekly GLP-1 medications tells you to rotate where you inject — abdomen, thigh, or upper arm — rather than returning to one spot. Memory is bad at this: “somewhere on the left” is exactly the answer that leads to using the same two square inches for a month. Write the site down next to the dose. “Right thigh” is enough detail, and rotation then takes care of itself. If you prefer a visual system for cycling spots over a written one, the injection sites map shows a rotation pattern you can follow without keeping notes at all.

One weigh-in a week, same conditions#

Weight is the number everyone tracks and the one most people track badly. Daily weigh-ins swing by a few pounds on water, sodium, and meal timing alone, and those swings are noise rather than feedback. One weigh-in a week under the same conditions each time — same scale, same morning, right after waking and before eating, same clothing or none — turns that noise into a readable trend. Record the number and the date, nothing more. After a couple of months, this weekly series is also what makes a weight loss calculator genuinely useful: you can set your own trend against published trial curves instead of guessing. One practical footnote: if you see both pounds and kilograms — one at home, the other at the clinic — pick a single unit for the log and stick to it, because converted numbers are where transcription errors creep in.

A short weekly note, not a diary#

One or two sentences, once a week: how the week went, anything unusual around shot day, whether your routine changed. The note exists to catch patterns — you will not remember in October which weeks felt rough in July, but three short notes that all mention the same thing are worth raising at an appointment. Practical details belong here too. If a pen traveled with you and spent days out of the fridge, note that; the fridge time tracker counts room-temperature days for you, so the note can be one line instead of arithmetic. Keep the format roughly identical from week to week — a stack of same-shaped notes scans like a column, which is what makes the pattern visible.

What not to bother tracking#

An honest list of what to skip. Calorie counting is optional: the labels pair GLP-1 medications with reduced-calorie eating, but no label requires a food log, and a tracking habit that collapses under its own weight helps nobody. Daily weighing adds noise faster than information, as covered above. Detailed day-by-day journaling is also more than most people need — the short weekly note catches patterns without turning record-keeping into a second job. The test for any extra field is simple: will you still be filling it in at week twelve? If the answer is no, that field costs more than it returns. The same goes for progress photos, tape measurements, and streak counters — genuinely useful if they motivate you, and safely disposable the moment they stop.

How to start the log this week#

You need one place to write, a repeating weigh-in slot, and about five minutes. The format matters far less than the habit — paper, a notes app, or a spreadsheet all work equally well. If paper is your format, the printable 12-week log has these columns already ruled and prints in one click; if you’d rather have an app hold the habit for you, the best GLP-1 tracker apps roundup compares the field by open data.

1. Step 1

   Pick one home for the log

   Paper, a notes app, a spreadsheet — anything works if it is always the same place. Records split across two places die fastest.

2. Step 2

   Log the next shot as it happens

   Date, dose, site — written right after injecting. A thirty-second entry beats a perfect one reconstructed from memory later.

3. Step 3

   Set a weekly weigh-in slot

   Same morning each week, same scale, same conditions. Put the number straight into the log next to the shot entries.

4. Step 4

   Add one line about the week

   A single sentence is enough. Written weekly, these lines become the patterns your appointments run on.

That is the whole system. If you would rather not maintain it by hand, a GLP-1 shot tracker app removes the by-hand part: injection-day reminders keep the log complete, a home-screen widget shows the days since your last shot and which site you used, and weight arrives from HealthKit instead of being typed in. The record is the point either way — whichever tool keeps yours complete is the right one.