The drug does not repeal thermodynamics
Every peptide and hormone protocol that touches body composition still runs on top of energy balance. A GLP-1 agonist does not melt fat by magic — it creates a calorie deficit by crushing appetite. A growth-hormone peptide does not rewrite the laws; it shifts where the calories you eat get partitioned. So the foundation under every chapter in this course is the same one that governs an unenhanced person: calories in versus calories out, with protein and training deciding how much of the weight you lose is fat versus muscle. The protocol changes the terms of that equation. It does not delete it.
Estimating your maintenance, then setting the gap
Total daily energy expenditure has four parts: your resting metabolic rate (the largest, ~60–70%), the thermic effect of food (~10%), and the two variable pieces — deliberate exercise and the unconscious movement of daily life (NEAT). The last one matters more than people expect, because it is the part that quietly falls when you diet, blunting your deficit without you noticing.
To lose fat, you set a deficit. The sustainable range for most people is a loss of roughly 0.5–1% of bodyweight per week — the leaner you already are, the slower you go, because aggressive deficits at low body fat come straight out of muscle (this rate is the figure the contest-prep literature uses to maximize fat-free-mass retention). To gain lean mass, you run a modest surplus; trained lifters gain slowly, so a small surplus (a few hundred calories) is enough, and anything larger just adds fat. Recomposition — losing fat and gaining muscle at once — is real but limited: it works best for beginners, the detrained returning to training, and people carrying higher body fat, while lean trained lifters recomp only slowly. The enhanced state widens this window, which later chapters cover.
Protein first, then fill the rest
Macros are not equal, and the order of operations is fixed. Protein is set first because it protects muscle and drives satiety — the two things that make or break a diet (the next chapter sets the exact targets). Dietary fat has a floor you protect next: the meta-analytic evidence is that very-low-fat diets measurably suppress testosterone, so the studied guidance is to keep fat above roughly 20–25% of calories (a practical per-bodyweight floor often used is ~0.6–0.8 g/kg, a reasonable extrapolation rather than a directly studied threshold). Carbohydrate fills whatever calories remain, biased around training where it fuels performance and glycogen. This "protein floor, fat floor, carbs flex" structure is the flexible-dieting frame the whole course uses, and it holds whether you are cutting, gaining, or maintaining — only the calorie total and the carb fill change.
Metabolic adaptation, diet breaks, and the exit
A deficit held long enough provokes adaptation: resting rate drifts down, NEAT falls, hunger climbs. This is why diet breaks — periods back at maintenance — are a tool, not a failure, and why the exit from a diet is as important as the diet itself. Snapping from a suppressed deficit straight back to pre-diet eating, on a metabolism running below baseline, is the classic rebound. The fix is the reverse diet: raising calories gradually (carbohydrate first, then fat back to its floor) so expenditure recovers as intake rises. On appetite-suppressing protocols this exit problem is sharper, because the drug was doing part of the work — a theme chapter 3 develops.
What this chapter sets up
Hold three things going forward: energy balance still rules; protein is the macro you set first and defend hardest; and the protocol shifts partitioning and appetite but never the underlying math. Every peptide-specific chapter that follows is a variation on this foundation — how a GLP-1, a GH-secretagogue, or an androgen environment changes the deficit, the partitioning, or the timing, without changing the rules.
Educational only; not medical or dosing advice. Macro targets vary by individual, training status, and goal.