Ivory Coast international Toure was handed a six-month suspension by the FA in May after being found guilty of taking banned water tablets.
His suspension has been backdated to March and he will be able to play again in September, but the FA have revealed that his battle with his weight led him to take the pills. The governing body have also said the 30-year-old claimed City`s club doctor, Jamie Butler, had okayed the tablets, a claim refuted by Butler and quashed by the FA.
A report issued by the FA reads: "The context is that for some years KT (Kolo Toure) has had a problem controlling his weight. He has become obsessed with his weight and more particularly the appearance of his belly."
The FA have released a 16-page report giving their reasons for the ban. Toure said he had been given the tablets by his wife, Mahoo, and the report continued: "MT put the water tablets into a drug dosette. On January 29, he travelled for the fourth round FA Cup match to be played against Notts County.
"He took his supplement including the dosette in a bag branded `Herbalife`. KT`s recollection was that he gave that bag (including the dosette) to the club doctor, Dr Butler, in the hotel restaurant early that evening and asked him, `...these are the supplements I take. Are they okay?`
"At the time two of the MCFC coaching staff, Attilio Lombardo and Fausto Salsano were close by. KT recalled Dr Butler looking through the bag, lifting out some of the contents and then telling him that `everything in the bag is okay`. That was not Dr Butler's recollection."
The statement went on to add that Toure "did not have any products with him at the time and simply informed him (Butler) he wanted to start taking `Herbalife` supplements". Butler added that Toure had given him some `Herbalife` products to check at the club`s training ground a few days later but "never saw the drug dosette".
The FA said: "It was not suggested that he was shown the medicine bottle with the `water tablets x21` label then or at any stage."
The report concluded that Dr Butler "never told him it was safe to use water tablets" and "he would unequivocally have said such were prohibited and should not be used".