After emigrating to Barcelona, he started a yogurt factory which later became Groupe Danone.

He noticed that many young children suffered from digestive and intestinal problems.

Inspired by the work of Ilya Ilyich Mechnikov, who had popularized sour milk as a health food, and recalling that such health conditions were treated with yogurt in the Balkans, he imported cultures from Bulgaria[1] or used "pure cultures that had been isolated in Paris" at Mechnikov's laboratory at the Institut Pasteur.

[2] Since yogurt was not well known then in Western Europe, he initially sold it as a medicine, through pharmacies.

[3] His son Daniel Carasso took over the family business in Spain and established Danone in France and later in the United States (as Dannon).