When a dragon repeatedly consumes a phosphorus-rich, calcium-low food, the debilitating and deadly condition MBD (metabolic bone disease) can result, causing your pet significant pain and even paralysis. So thats why bearded dragons can eat bananas only in small doses once or twice a month. Another reason dragons shouldnt be eating too many bananas: they contain a lot of sugar when ripe. Similar to humans, Its perfectly fine for dragons to have some sugar...but too much can cause ...