Beyonce doesn't let her daughter eat sugar.

The 'Drunk in Love' singer has Blue Ivy, two, with rapper husband Jay-Z and they are committed to her having as healthy a lifestyle as possible, which means cutting out unnecessary sweet treats.

A source said: ''She make sure Blue only eats healthy. She doesn't get any white sugar unless it's a birthday party or a special occasion.''

For a treat, Beyonce is said to give the youngster fruit slices, and she is not allowed any pre-packaged goods either.

The source added to Us Weekly magazine: ''Processed foods are a big no in their family.''

In December last year, Beyonce and Jay took up a challenge to eat only vegan food for 22 days, which they broke only at Christmas.

Explaining the challenge, Jay wrote on his blog: This all began a few months back when a good friend and vegan challenged me to embrace a 'plant-based breakfast' every day. It was surprisingly easier on me than I thought...

''I don't know what happens after Christmas. A semi-vegan, a full plant-based diet? Or just a spiritual and physical challenge? We'll see... (sic)''