Guide
Scale weight answers one question badly. On a dual agonist the numbers worth watching are how much of the loss is fat, whether lean mass is holding, and what the metabolic panel is doing — three things a weekly weigh-in cannot separate.
Sixteen pounds off the scale can be thirteen pounds of fat and three of lean, or it can be nine and seven. Those are different outcomes and the scale reports them identically. If you have access to a body-composition scan — an InBody at a gym, a Withings or similar at home — the useful record is fat mass and fat-free mass as two separate lines over time.
BioHack Track imports a scan by photographing the readout or reading the export, keeps every metric on it as its own series, and charts fat mass against fat-free mass so you can see which one moved. That is the chart worth showing a prescriber.
A plateau is weight flat while body composition keeps improving — fat down, lean up or level. That is progress the scale is hiding, and it usually needs nothing but patience. A stall is everything flat: weight, fat mass, waist. Only one of the two is a reason to change something, and you cannot tell them apart without a second measurement.
Waist circumference is the cheapest proxy if you have no scan. Same time of day, same place, weekly.
Metabolic markers are where a GLP-1/GIP agonist shows its work beyond the scale: fasting glucose, HbA1c, fasting insulin, triglycerides and HDL. A baseline before you start and a repeat at three to six months is the pattern most prescribers use.
Enter them by hand for free, or import a whole panel from your lab portal's PDF with Pro. Either way each marker is charted against its own reference range, so a value drifting toward the edge of normal is visible before it crosses.
Lean-mass loss on aggressive calorie restriction is the well-known failure mode, and the two things that blunt it are protein intake and resistance training. If you are tracking them, track them in the same place as the doses — a lean-mass line falling while training sessions dropped off is a story you can only read if both are in one chart.
Tirzepatide is expensive enough that cost per pound is a real number people want. If you enter what a vial or pen cost and link it to the protocol, the app totals spend per month and per compound, and pairs it against the body-composition change. The vial cost calculator does the per-dose arithmetic in the browser if you just want the figure.
No. Weight and waist by hand cover the basics, and both are free. A scan adds the fat/lean split, which is the part a scale genuinely cannot give you.
Every two to four weeks is enough to see a trend without chasing noise. Consumer scales are more consistent than they are accurate, so the direction over several readings is worth more than any single number.
Yes. Past protocols stay in your history with their own dates, so the weight and body-composition charts run across both and you can see where one ended and the other began.
Yes, on both platforms, and a record shared from one reads on the other.
For personal tracking. Not medical advice, and not a substitute for your prescriber.