Someone loses 10kg. It sounds like an obvious success.
But what did they lose?
Fat, hopefully. Water, certainly. Lean tissue, quite possibly. The bathroom scales bundle all of it into one number and leave us to guess.
That is the gap LeanShield is trying to fix.
It does not measure your muscle
This distinction matters.
LeanShield is not a body scanner. It cannot look inside someone and announce exactly how much fat or muscle they have lost. Any product pretending it can do that from a few taps on a phone should be challenged.
LeanShield is a decision-support system. It looks at the behaviours we can influence and asks whether they are moving in a muscle-protective direction.
The current score is built around three main areas:
- Resistance training that gives the muscles a reason to stay.
- Enough protein to support recovery and lean tissue.
- A calorie deficit that is effective without being needlessly aggressive.
It then turns those inputs into clear next steps. Train today. Bring protein up. Ease back on the deficit. Keep doing what is working.
I explain the original thinking in this episode about why I built LeanShield.
A score is a prompt, not proof
People like scores because they make complicated information easier to act on. That is useful, but it creates a risk: the number can start looking more certain than the evidence behind it.
A high LeanShield score should mean that your recent behaviour is more consistent with protecting muscle during fat loss. It should not be presented as proof that no muscle has been lost.
That proof has to come from outcomes.
Do people using the system maintain or improve strength? Do waist and body-fat trends move in the right direction? Do they keep more lean mass where better measurement is available? Do they stay engaged for long enough to benefit?
Those are the questions that matter now.
Why bother building it before every answer is known?
Because people are losing weight today.
GLP-1 medicines have made large reductions in body weight possible for many more people, often very quickly. The support around that weight loss has not caught up. "Eat less and move more" is not enough. Neither is handing everyone the same gym plan and assuming they will follow it.
We need a practical layer between the research and someone's Tuesday afternoon. Something that notices a gap and gives one useful action while there is still time to do it.
That is LeanShield at its best: not a magic shield, and not a clinical measurement dressed up as an app. A clearer daily guide to doing the things most likely to protect strength while losing fat.
Now we have to earn the claim by testing it properly.