Our expert says:
There is a big change over time. The body produces less of the key hormones that are required to cause the adaptation to training - less testosterone, for example, means less muscle adaptation. Less muscle and less lean mass means lower metabolic rate, which adds up, over time, to cause weight gain. So that's what you are fighting against.
Diet helps because you rapidly cause changes in the balance between energy in and out. That's a short term win, but it's not a long term argument because it actually ends up slowing your metabolic rate down even more anyway.
The training will never work in 2 weeks though - it takes much longer. You have to give it much more time and much more consistency. My feeling is that with ageing, the most important concept is that you give the body consistency. Chaning your tactics often doesn't too any good. So I don't know what is specifically in play here - your training history is relevant, but I don't know what has changed between now and then (apart from age). But reading between the lines, it seems there is a lack of consistency, and that's what needs to be addressed, in my opinion...
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