Studies from the 1930s and 1940s suggest that children, when given a choice, tend to balance acidic and alkaline foods by selecting both fruit and meat, with less frequent selection of tubers or vegetables.

“in studies of kids I found it interesting to note that though these studies are quite old and they haven't been repeated when children are given a selection of foods to choose from they generally balance acidic and alkaline elements meaning they generally select some fruit and some meat and then occasionally they select a few tubers but if you give kids the ability to choose their diet at least in studies from the 1930s and 1940s they don't really go for vegetables that often”