Oat milk is trendy and has a reputation for being particularly environmentally friendly. It is also vegan and also suitable for people who do not tolerate cow's milk very well. The reason: oat milk does not naturally contain lactose, which can lead to flatulence and diarrhea in sensitive people. The oat-based cereal drink can also be an alternative for people with an allergy to milk protein, as it does not contain any animal proteins. So is oat milk the healthier - maybe even better - choice compared to cow's milk?