I was writing this sentences, could you check it, please.

Question

Sue hasn’t eaten any fruit or vegetables for a while.

Ned started to eat healthier food last year.

Sue hasn’t never visited a doctor on a regular basis.

Ned has lived a quiet life before they met.

Ned has smoked heavily when he was young.

Sue and Ned both want their life healthy lives.
Thanks

Answer 1

Sue hasn’t eaten any fruit or vegetables for a while.
OK

Ned started to eat healthier food last year.
OK

Sue hasn’t never visited a doctor on a regular basis.
Not OK

Ned has lived a quiet life before they met.
Not OK

Ned has smoked heavily when he was young.
Not OK

Sue and Ned both want their life healthy lives.
OK, but sounds a little odd.

Answer 2

http://grammar.ccc.commnet.edu/grammar/confusion.htm#double_negatives

http://grammar.ccc.commnet.edu/grammar/sequence.htm

Answer 3

Sue has never visited a doctor on a regular basis.

Ned had lived a quiet life before they met.

Ned hasn’t smoked heavily when he was young.

Answer 4

The first two are fine now.

The last one, however, is still weird. This would work: Ned didn't smoke heavily when he was young.