用英文回答：What's a healthy diet?what's a un healthy diet?why we eat every day?

A healthy diet contains lots of fruit and vegetables; is based on starchy foods such as wholegrain bread,pasta and rice; and is low in fat (especially saturated fat),salt and sugar.
1.Base your meals on starchy foods
2.Eat lots of fruit and veg
3.Eat more fish
4.Cut down on saturated fat and sugar
5.Try to eat less salt - no more than 6g a day
6.Get active and try to be a healthy weight
7.Drink plenty of water
8.Don't skip breakfast
an unhealthy diet is on the contrary of the healthy diet.
the last question
you consume energy when act,think,even doing nothing and you have to make it up!you can get it from eating.that's it!