Does oat milk break a fast?

Oat milk has about 45 kcal per 100 ml, close to semi-skimmed dairy milk. A 50 ml splash in coffee adds about 23 kcal and a 250 ml glass about 110. Per 100 ml it carries about 2 g of sugar, against under 1 g in unsweetened almond milk.

This site sorts answers by four goals of its own. For weight loss, one splash of oat milk is grey, as it sits under the 50-calorie rule of thumb. That figure is a common guide and not an official limit. The extra sugar makes oat milk more likely to raise blood sugar, so a splash breaks a blood-sugar fast. Its calories also break the stricter autophagy and gut-rest goals.

Barista blends and sweetened oat milks differ from the plain carton, so check the label for calories and sugar per 100 ml. For a lighter splash, unsweetened almond milk has about a third of the calories of oat milk per 100 ml.