Giving blood doesn't make you lose weight (sad, sad!) only liquid. I checked this with the Red Cross during my many years of donating blood. I think only the less eating, more exercise that works. But at this time of the year with temperatures between 35-40 deg C it's hard to exercise without almost killing yourself. Whoever finds a pill that makes you lose weight safely will make a fortune. But why have we all had a problem with weight over the last 20-30 years (I don't just mean that we have got older). Movies from the 70's and 80's show everyone to be much thinner - whether young or old.
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