Grapes are also a big no no for diabetics too unless your sugars are low.
Bananas are a big no no for people with heart conditions as they are very high in potassium, the odd one is fine.
They are not too good for you if you have a kidney function problem too for the same reason.
Grapefruit are an absolute no no for anyone taking Statins, in particular Simvastatin, the grapefruit prevents the drug being processed by the liver resulting in an eventual overdose and death.
So much for five a day eh!