Lactose intolerance

Lactose intolerance is linked with low activity of lactase, the enzyme that breaks down milk sugar. Undigested lactose reaches the colon and is fermented by bacteria.

Typical symptoms include bloating, rumbling, gas, cramps and diarrhea after milk, cream, ice cream or other foods with meaningful lactose. Tolerance differs between people.

How It Differs From Allergy

This is not allergy to milk protein. Allergy may cause skin, respiratory or systemic reactions, while intolerance mainly affects digestion and symptoms depend on lactose dose.

Keto And Dairy

Keto often uses cheese, cream, cottage cheese and yogurt, but lactose content varies. Hard cheese is usually tolerated better, while milk and sweet yogurt may be problematic for both digestion and carbohydrates.

How To Check

A food diary, a lactose elimination trial, hydrogen breath testing or clinician assessment may help, especially when symptoms are severe, sudden or accompanied by weight loss or blood.

Practical Conclusion

Dairy should be chosen by tolerance, not banned automatically. Lactose-free options or lactase may help, but warning symptoms need diagnosis.

Where Lactose Hides

Lactose may be present not only in milk, but also in whey, milk powder, some sauces, protein powders, medications and sweet dairy foods. Aged cheeses and butter usually contain much less lactose.