If noting unusual ever happened then I might agree with you but unusual events like significant US food aid after disasters are going to significantly affect these numbers even if it’s just for a few meals after an earthquake or political subsidy such as in 1965-1966 where US cheese flooded India. Several other countries had similar events during the early days of the green revolution.
Mad Cow disease is a more recent example where global supply chains shifted and suddenly people were eating a lot more imported products or products from different countries.
Further, from restaurants, ingredients in packaged food, vacations, baby food, pot luck’s, to one off sampling of a MRE many people have done something once which completely changed the supply chain for their normal diet.
PS: I’d agree it’s under 50% globally when including children, but for the HN audience specifically it’s probably over that.