meat fat vs. sugar fat

recently someone was saying that paople who eat too much meat and get fat aren’t the same fat as people who get fat on sugar and someone else said that that’s the same thing as Atkins and the first guy said it’s different and I said that if you’re running properly you won’t get fat in the first place. W/ such a winning argument on my side, they both started running and I can’t see so well out of my peropheral vision but they both seem pretrty skinny.