Stablemates Osborne Machimane and Zolani Marali have both been put on an expensive special diet.
This comes after South African heavyweight champion Machimane's below-par performance against Wiseman Dlomo last weekend.
He looked better than he has in his whole career, but was, however, lethargic and lacked mobility.
Their grudge fight, which Machimane won in seven rounds, was broadcast live on Blow by Blow at 10pm.
Disappointed fight fans called SABC just after the stoppage and labelled the fight an embarrassing advert for the noble art of boxing.
Machimane and WBF junior-featherweight champion Marali's manager Ross Behr, who doubles as their physical trainer, wants to get the best out of his charges.
"I assessed them and and saw that the kind of food they ate lacked nutritional vitamins and minerals, which are very important for training," he said.
Behr said his painful but fruitful methods that helped Springbok prop Ballie Swart to become a tower of strength when South Africa won the World Cup against New Zealand in 1995 must be supplemented.
"Wrong eating affects every sportsman's performance. South African fighters generally have done well with their poor eating methods.
"I just wonder what would they have achieved if they were on proper nutrition," he said.
The car dealer, who has just finished building the Rossco Boxing Gym in Malvern, is not perturbed by that special diets cost lots of money.
"I want to do the best that I can to help these guys fulfil their ambition," he said.