First I have been trying to adjust by increasing the amount of exercise, that worked for a while, but then it lead to the injuries. I have been trying to adjust in terms of what I eat, and how much, but eating is one of my pleasures in life so it has been really challenging.

ZipFizz is not a soft drink, it is an energy drink with 205 mg of "Energy Mix" 100 mg of which is caffeine, it also has a bunch of B vitamins and other stuff that is supposed to boost your energy levels. I don't think it is very healthy, but I must say pure caffeine doesn't work as good as ZipFizz for me. With ZipFizz I feel a clear boost of energy 15 minutes after drinking. I used to work out with an ex-personal trainer at the gym (we worked in IT together at the time) and I mixed one of the drinks for him and he said that it is the best boost he ever experienced outside anabolic steroids. I never tried steroids so I wouldn't know :)