@RubyRedEye As everyone else has said, these are some really great updates.
"I feel that communication has only been possible this evening, one because I had the confidence in what to say to him from reading advice. Two because he saw me upset and crying. Three because it came to a head."
Often, the truth of a situation only really does come out when things come to a head.
If I may add another couple of points.
"and as I mentioned, he’s stopped eating proper food. For tea tonight he will have a protein shake, with about 4 eggs in it, raw."
The fasting may only be temporary but, from what you have said, he may wish to carry on eating like this.
My DH went through something similar a few years ago (although, he was mid 50s back then)
I found two books really helpful in this respect. They're both on Amazon.
The first is Principles of Body Transformation Meal Plan Design by Nick Mitchell & Jonathan Taylor, £24.99. This goes into lots of details about calculating the amount of protein and fat etc you need to eat each day to reach your goals. This is a lot more about the theory of it.
To be totally frank, that book goes into a lot of detail. If you're just interested in finding some recipes that give you the right sort of mix of protein, fats and carbohydrates etc then I found another book of his, The Ultimate Performance Cookbook.
I've just checked on Amazon and this is no longer available there but if you google it then it is still available from their own website for £19.99.
I really can recommend this cookbook and I'll post a couple of recipes from it below.
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I would also totally agree with everyone else here who has said that going to the gym every day of the week is not the way to do things. Especially what @PeggyMitchellsCameo said yesterday. Especially this part:
"He also said that a healthy diet is the key component. While exercise is useful, a balanced diet is the most important component."
Having said that, when it comes to personal trainers; there are PTs and then there are PTs. Some are great, some less so. Some will happily just put your DH on cardio equipment for an hour and just sit back and take the money for standing next to them.
You need somebody that will design a proper programme for them based on their own starting point and goals.
Absent such a PT then maybe have a look at some books? Just one example is Your Ultimate Body Transformation Plan: Get into the best shape of your life – in just 12 weeks, currently £6.99 on Amazon.
Below are a couple of pages from that book.
My own DH a few years ago ended up going to a very expensive PT and that did make a real difference for him - I even ended going along as well and it made a huge difference to me as well.
But that was incredibly expensive, the books I mentioned above are a cheaper way of doing things.
Here are some recipes from the cookbook and I may have to attach the images from the exercise book in another post (sometimes you're limited as to how many images you can attach)