Have just been to the Doctors. I had a cholesterol and a couple of other blood tests (which I didn't know what they were for) a couple of weeks ago and when I rang for results they said the doctor wanted to see me, not urgently but soon, so I went on holiday and went to Doctors today. I thought my cholesterol must have been on the very high side (which runs in my family) but it was only 5.8 which is slightly high, but she said my kidneys were showing signs of strain. She says this could be because I was overweight (I have now reached a healthy bmi after losing just over 4 stone, so not tons and tons overweight) and I was wondering (but didn't say to her) that could it have been caused by the amount of water you have to drink whilst on the Cambridge Diet as I was always in the toilet. DH has also said it can be caused by too my protein in your diet and of course the first steps to maintenance on Cambridge is protein and I have nearly finished maintenance now so would have been eating mainly protein at the time of my blood test... Now worried that I have lost weight to be healthy but am ruining my kidneys in the process.... anyone had similar?