Research into what athletes need is very helpful also for older people because its often about how to maximise muscle.
This research from the Netherlands shows that eating protein foods close to the time you do exercise helps boost your muscle levels.
If you want to build muscle at later age that might mean any of before, straight after or even during good, strenuous exercise. Protein drinks can be a good option at such times when eating solid foods can be a challenge. there are plenty of commercial protein supplement drinks and there are everyday recipes for some in Eat To Cheat Ageing.
Its interesting that this study didn't necessarily show that additional muscle resulted in better performance in athletes, but for older people, any increase in muscle is of benefit to your immune system and body organs, so its most likely worth thinking about.
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