There is absolutely no such thing as "chemical free". Water, lactic acid, casein, and so on, they're all chemicals, even if you have glorified them with a stamp that says "natural".
"Chemicals" when used in the context of food, means "artificial food additives".
You may disagree that such additives are bad for you health - but just how our early ancestors had low-lactose tolerance, we also have low tolerance for such additives. Maybe our children's children will be able to digest such foods better / more efficiently and without side-effects, but in the meantime there's a wealth of research showing strong links between food additives and increasing rates of cancer, obesity and diabetes.