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MuscleAI doesn't use a generic protein formula. Your daily target is built specifically around your body, your activity level, your age, and — if applicable — your GLP-1 medication. Here's exactly how it works.
The starting point is your lean body mass (LBM) — the weight of everything in your body that isn't fat. Muscle needs protein to maintain; fat doesn't. So protein targets are based on LBM, not total body weight.
We use the Boer formula, a well-established method in clinical nutrition:
For men:
LBM (kg) = (0.407 × weight in kg) + (0.267 × height in cm) − 19.2
For women:
LBM (kg) = (0.252 × weight in kg) + (0.473 × height in cm) − 48.3
Your LBM is multiplied by a base rate depending on your selected mode (Standard, GLP-1, Bulk, Cut, Plant-Based, etc.). This rate reflects how much protein per kg of lean mass is needed to preserve or build muscle for that goal.
Your activity level (Sedentary, Lightly Active, Moderately Active, Very Active) adjusts the base rate up or down. More activity means more protein turnover and a higher target. Sedentary users get a slightly reduced multiplier; very active users get the full or increased rate.
Research shows older adults need more protein per meal to achieve the same muscle protein synthesis response as younger adults (Moore et al.). MuscleAI applies:
| Age Range | Adjustment |
|---|---|
| Under 36 | No adjustment |
| 36–50 | +5% |
| 51–65 | +10% |
| 65+ | +15% |
Different GLP-1 medications suppress appetite to different degrees. The stronger the appetite suppression, the more important it is to be deliberate about protein. MuscleAI applies a medication-specific multiplier: