Lactose

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Foods that require milk in the preparation: pastries, cakes, cookies, puddings, ice cream, fruit ice cream, chocolate. Precooked or instant mashed.

Other foods: pizza, broccoli, mushrooms, pears and cold cuts (ham and mortadella in particular).

Fast Foods: Hamburgers, cheeseburgers, chicken, soups, sausages, hot dogs.

Lactose

Lactose intolerance, not considered as allergy, but as a real difficulty in the digestion of this sugar, is the most frequent intolerance in the world.
This is due to the reduction of β-galactosidase enzyme responsible of lactose digestion. This enzyme breaks down lactose into the two simple sugars that comprise it, glucose and galactose, allowing its absorption and use.

β-galactosidase is an enzyme naturally present in humans. Normally its activity is highest at birth but physiologically declines with age, up to 90% of the original value.
In cases of lack of β-galactosidase, lactose reaches undigested the intestine where it is fermented by the flora, causing problems such as diarrhoea, abdominal pain and cramps, bloating and flatulence.

Lactose is present not only in milk and dairy products (cheese, butter, cream, yogurt), but also in much other food that we would not expect to find it in, as it is used as a preservative in meat, minced meat, chicken meat, mashed potatoes, instant soups, baked goods, candy, snacks and many others.