Dr. Valter Longo suggets limiting fruit to one a day

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https://www.valterlongo.com/cardiovascular-diseases/
>Yes: fruits, but only one or two a day (e.g., one apple or orange, two handfuls of blueberries, blackberries, or strawberries)
(from his fasting mimicking diet for longevity.)
How dangerous is excess fruit consumption (e.g., 2-3 apples a day)?