1, Quite a few of us have avoided weight gain or have been able to lose weight. Some of us cut carbs drastically and it worked. On a different forum some ladies have done very well losing weight gained while on pred by using the Slimming World plan - one has lost 16lbs in the last 7 weeks. Another has lost even more but obviously over a longer period. I lost 36lbs on low carb.
2. PMR can also cause depressed mood - but if the pred makes it worse, get him to speak to the doctor. Medication can help. if he won't have that - is counselling an possibility? Coming to terms with chronic illness is not easy!
3, No. Is the quick answer! About a quarter of patients are off pred in up to 2 years but they tend to have a higher risk of relapse later. About half take up to 4 to 6 years. The rest of us take longer, some need a low dose of pred for life - though that is probably because of poor adrenal function rather than PMR itself. That said, men seem to experience PMR differently from women and often have an easier journey - no-one knows why, probably something to do with hormones. There are about 2.5 times as many women with PMR as men.
4. No - GCA is a rare disease. I suspect your books over-egged the pudding! About 1 in 6 people who show PMR symptoms go on at some point to develop GCA but that is as much because people can have PMR as the symptoms of their GCA. Most of us never even have raised blood sugars never mind develop diabetes. Some become pre-diabetic but that isn't the same. Pred messes up carbohydrate metabolism but it isn't true diabetes and once you reduce or stop pred it resolves. Keeping carbs to a minimum obviously helps. The GP should be doing an Hba1c test every few months - it monitors the average blood sugar level. You can have raised fasting blood sugar without you average level being raised - both I and my husband who doesn't take pred have that!
5. Not a lot - he's hopeless despite having been a healthcare professional! if i were going to say anything - appreciate that fatigue of autoimmune disorders isn't visible and makes you very bad-tempered! So does pred! And don't say - "oh you can manage a bit extra surely, you can rest tomorrow". It doesn't work like that! Make sure he is kind to himself!
6. There aren't any. Some people eat oily fish and use garlic and turmeric in cooking and say they feel it helps them. I restrict carbs - doesn't make much difference to the PMR, it does help the weight! If I eat carbs I don't lose or even gain weight. Sugar is a very pro-inflammatory substance - I rarely use it, I don't have a sweet tooth. Obviously there is some in certain things I eat or drink but it is minimal - I eat a dessert once every few months and almost never eat cakes and never sweeten drinks. I do eat chocolate but mostly dark, min 70% cocoa solids., mostly higher.
You will come across people who have been told by their doctors not to eat this that or the other - it rarely seems to make any difference, they struggle as much as anyone else - often more because of the restrictions of the diets. I've tried gluten-free (I was gluten-free when it first started as I have a wheat allergy), no alcohol, no nightshade vegetables, almost dairy-free - all any of that did was restrict my diet even further! No difference in the PMR. There is absolutely no evidence that any particular diet can make any difference to PMR - everyone is different though and maybe avoiding some things may help someone feel better, but it may not be the same as helps me.
It has been commented that you feel as if you have lost control - you CAN exert control over your diet as a compensation.
Have you seen the reading list? And the slow reduction approach - because that is as important as anything else. Rushing at a reduction will only lead to tears, either because it induces steroid withdrawal aymptoms which are so like PMR you think it is a flare or you develop a real flare because you reduced too fast or too far. Slowly does it.
https://patient.info/forums/discuss/pmr-gca-website-addresses-and-resources-35316