Floyd Mayweather - ON THE FAT KID DIET ... For Berto Fight

screw the vegetables and protein shakes, Floyd Mayweather is LETTING HIMSELF GO for his battle with Andre Berto - stuffing himself with frozen yogurt and cake amid preparing camp ... TMZ Sports has learned.

It's very nearly an INSULT to Berto - since Mayweather was fatal genuine about his eating routine for the Pacquiao battle ... removing anything that wasn't considered "sound" by his own gourmet expert
n truth, we talked with Chef Q - who lets us know Floyd has been wayyyy more chill about his eating routine this time around ... "He's attempting to have a great time."

Culinary expert says Mayweather welcomed his whole family to his Vegas compound for this camp in light of the fact that he needs to invest more energy with them while preparing.

"He's doing what he needs to do and eating the way he needs to eat. He's more casual regarding his eating regimen and his way of life."