Much simpler and safer to manage pred weight gain is to cut your carbs drastically - especially processed foods, added sugar and limit root veg and fruit. Best is obviously to start at the beginning and avoid the weight gain but it is possible to lose weight even when on pred - I lost 35lbs in about 18 months by cutting carbs. The only medication in the UK for polymyalgia rheumatica is pred so on my home forum we have lots of experience with weight management. Many of us have avoid weight gain or lost weight we had gained, some have reversed Type 2 diabetes despite the risk of steroid induced diabetes so we can say hand on heart it does work.
Cutting processed carbs also reduces salt intake - also has a role in steroid weight gain as it causes fluid retention. The website dietdoctor is a good introduction to the concept:
The injections are a long term committment - if you stop them, the weight goes back on. And they do have side effects - a lot of patients give up after a few months because of them.
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