Jennifer Aniston can't cook.

The 48-year-old actress - who is married to Justin Theroux - insists she is ''really good'' at making convenience foods, but when it comes to crafting a ''beautiful'' meal, she's always been too busy to learn.

She said: ''I would love to really learn how to cook and prepare beautiful meals, I just don't have the time.

''[My trick is that] we call them cuppa eggs and they're these little poached eggs. I put them in a to-go cup. I'm really good at quick, on-the-go types of food.''

The 'Cake' actress has grown increasingly aware of using natural products and is much more ''strict'' with her diet than she used to be.

She said ''I'm definitely strict about what goes into my body. I got rid of Sweet 'N Low, Splenda... all those things we thought were good for us when we were getting rid of sugar.

''The thing that still needs to go is my Coffee-Mate creamer, but that's my last guilty pleasure.''

Despite her toned physique, Jennifer is only just getting back into exercise following a long lay off due to injuries.

She told Red magazine: ''This has been my year of injuries. I screwed up my back a bit.

''But I'm getting back into it now. There's a treadmill workout I d that's just interval for about 40 minutes and then I go into the gym and work out with my trainer.

''Then I do The Class, which is a whole other new thing that has become an obsession of mine.

''It's a mind, body, soul sort of experience. And I do a combination of all kinds of yoga, mixed in with a little barre.''