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I was diagnosed with hypothyroidism about 4 years ago after some very unpleasant illnesses which pretty much curtailed my training. I've been on levothyroxine ever since with blood tests every 6 months. Last September I completed my first marathon for 10 years. Since then I have cut back my training to pre marathon levels, and continued with my 3 weekly hard core aerobics classes, My speeds have gone up and I'm feeling great. BUT, I've been losing a lot of weight, my hair is falling out, and I'm not sleeping well. I've got another blood test booked in a couple of weeks, but I wondered if anyone had an opinion on whether my exrecise level is making me need a lower dose of levothyroxine. Has anyone tried varying their dosage to take into account their increased/decreased activity level?