Our expert says:
Dear Ai Tog
Although people tend to slowly gain weight at the rate of about 1 kg per year as they grow older, I don't think the 9 kg you have gained since September are due to ageing! Please check the energy content of that protein shake. If you are using it to replace a meal and you don't want to gain weight with it, then the shake plus the liquid you mix it with (water of skim milk, etc) should not contain more than 2100 kJ per serving (e.g. 1 glass). If the shake contains more energy then you will know that this is what has been making you gain weight. However not being able to run long distances for 2 months can have the same effect. So check the protein shakes and if possible get back to running.
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