Are there any cheeses that should be avoided outright?
Yup! Fresh cheeses, and those with a lot of curds, tend to have the highest lactose percentages. Here are the main culprits:
Feta: Approx. 4.1% average lactose Ricotta: 0.2-5.1% lactose range Colby: 1.6-5.2% lactose range American: 1.6-5.2% lactose range Velveeta: Approx. 9.3% average lactose American (pasteurized): 0-14.2% lactose range