Anti-Eczema Diet of Lamb and Cheerios Leads to Boy's Vision Loss (2017)
livescience.com
livescience.com
Indeed, when the doctors measured the levels of vitamin A in the boy's blood, they found that he had a vitamin A deficiency. The boy's blood levels of vitamin A were 14.3 micrograms per deciliter (ug/dL); the normal range for this vitamin is 25.8 to 48.7 ug/dL, according to the report. Cohen said the boy's deficiency was severe.
I didn't understand if the diet was home-developed or was prescribed by some doctor. If it was the former, why simple supplements weren't added ?
High doses of ferrous iron (but not ferric iron) or other minerals (calcium, magnesium, and zinc) from supplements may decrease the absorption of carotenoids, such as beta-carotene, lycopene and astaxanthin, from foods and/or supplements. This is likely due to a reaction between carotenoids and the divalent ions of these minerals, making the carotenoids less bioavailable (Corte-Real, Food Chem 2016; Biehler, J Nutr 2011). It is best to take carotenoid supplements at a different time of day than a supplement or meal containing large amounts of a mineral.
https://www.consumerlab.com/reviews/Vitamin_A_Retinol_Beta-C... (paid registration required)
The addition of potatoes and apples makes the case far more interesting imo, as it makes the diet closer to what many people might think is sufficient.