Kim Kardashian West says Kanye West ''is always on different diets.''

The 'Keeping Up with the Kardashians' star, who has 21-month-old daughter North with her rapper husband, claims the 'New Slaves' hitmaker has become obsessed with clean eating since hiring a personal chef and nutritionist, and hopes adopting his healthy habits will help her to get pregnant again.

The 34-year-old beauty said: ''Kanye loves to eat really healthy and is always on different diets. He has a chef who comes in the morning and cooks breakfast for both of us and gets our meal plans together for the day. We just started seeing a nutritionist who changes our diet every 10 days.

''I think after you have a baby you want everything to be as pure as possible. I want to set an example and to be natural and healthy. It's a decision Kanye and I made, to see a nutritionist together. Also, I think anything could help if I'm trying to get pregnant.''

But Kim admits she still has a sweet tooth.

She said: ''If I need a sweet-tooth fix, I'll have those Justin's peanut butter packs; the almond butter is also really good. I'll just eat it plain. I used to drink a ton of iced tea, but I've cut back.

''I don't really have cocktails or desserts - I mean, I wish! Haagen-Dazs is my biggest indulgence - their Dulce de Leche flavour is my favourite thing in life.''

The reality TV star plans all of her workouts around North's sleeping schedule.

She told the May issue of Harper's BAZAAR magazine: ''I used to work out at a gym more often, but now I stay at home because I want to be there when my daughter wakes up, which is around eight. It's my favourite time of the day with her, so I don't want to miss it.''