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Fast weight loss takes tissue you would rather keep

Weight on a scale is not one substance. When it falls, some of what leaves is fat and some is lean tissue — muscle, and the water and glycogen stored with it. The proportion is not fixed, and two of the things that move it are within your control.

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The share is not small

Across weight-loss studies, lean mass has commonly accounted for something in the region of a quarter of total weight lost, and higher where loss is rapid and unaccompanied by resistance work.

Why it matters beyond appearance

Muscle is where most of your glucose goes after a meal, and it is what stands you up out of a chair at seventy. Losing it is easy; putting it back is considerably slower than losing it was.

The two levers

Loading the muscle, and eating enough protein. Neither is exotic and neither requires a gym. Both are harder while appetite is suppressed, which is exactly why they need to be deliberate.

What to measure instead of the scale

A 30-second sit-to-stand count is free, takes half a minute, and responds to strength work long before the mirror does. It is also the measure that keeps going up while the scale is stalled.

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FAQ

Can I rebuild it afterwards?

Yes, though it takes longer than losing it did, and rebuilding while still in a deficit is harder than protecting it in the first place.

Does walking protect muscle?

Walking is worth doing for other reasons. Protecting lean mass specifically wants a resistance stimulus.

How would I know it is happening?

You would not, from the scale. A strength measure that stalls or falls while weight drops is the signal most people can actually observe.

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General information about physical activity, not medical advice. It does not diagnose anything and does not replace your doctor. If you have chest pain, or have had a cardiac event in the last six months, speak to a clinician before starting.