- Muscle mass
- the amount of muscle on your body. After sixty it tends to decline on its own unless you give it a reason to stay, which is why protecting it is the heart of this book.
- Sarcopenia
- the medical name for serious age-related muscle loss. You don't need the word, only the fact underneath it: unused muscle slowly leaves, and it's worth working to keep.
- Protein
- the part of food your muscles are built and maintained from, found in eggs, fish, meat, beans, lentils, dairy, tofu, and nuts. Spreading it across your meals matters more with age.
- Resistance work
- any activity that makes a muscle push against a meaningful load, chair stands, bands, light weights, wall push-ups. The signal that tells muscle to stay and rebuild.
- Non-exercise activity
- all the ordinary movement of a day, walking, chores, stairs, standing, that adds up to more than most workouts and is gentle on the body.
- Fiber
- the filling, slow-digesting part of vegetables, fruit, beans, and whole grains. Helps you feel full and stay full.
- Plateau
- a stretch where weight stops changing. Usually normal, often the body settling at a new weight, and sometimes just fat quietly swapping for muscle where the scale can't see.
- Maintenance
- the long phase of keeping a healthy weight and your strength once you've reached them. A skill of its own, not the absence of dieting.
- Registered dietitian
- a qualified food-and-nutrition professional who can tailor eating and protein to your specific body and conditions. The person to ask the specific questions this book deliberately leaves to an expert.