Start with the calculator, end with the markers

Bodyweight times an activity multiplier is a fine starting estimate. After two to four weeks of consistent tracking, the labs and the scale tell you whether the estimate was right for you. Adjust based on signal, not on a number from a TDEE formula.

Markers that should drive your macros

Fasting glucose and HbA1c

Creeping fasting glucose on a bulk usually means too many carbs at the wrong times, not necessarily too many calories overall. Try shifting carbs around training and watch the next draw.

Triglycerides and HDL

High triglycerides with low HDL on a high-fat plan is a sign that the fat-to-carb ratio is wrong for your metabolism. Replacing some saturated fat with carbs from whole foods often flips this within a cycle.

TSH, free T3, free T4

A long deep deficit suppresses thyroid output. If T3 falls and TSH rises during a cut, you are leaving performance — and recoverability — on the table. Refeeds and diet breaks are not optional.

hs-CRP and ferritin

Persistently elevated inflammation despite clean training usually points to undereating, gut issues, or poor sleep — not your protein source. Treat it as a signal to deload before pushing harder.

A simple weekly review

1. Average the last 7 morning weights — ignore daily noise.
2. Compare against your target rate of gain or loss (~0.25–0.5% bodyweight per week).
3. If actual rate is off target by more than half, adjust calories by 5–10% — never more.
4. Hold protein constant at 1.6–2.2 g/kg. Adjust carbs first, fat second.
5. Re-test the relevant labs every 8–12 weeks to confirm the direction.

When the labs and the mirror disagree

Trust the trend, not the snapshot. A single high glucose after a holiday weekend means nothing. Three consecutive monthly draws drifting in the same direction mean everything. Build the habit of plotting your results on a timeline so the pattern is obvious.