Adelaide,

 There's usually one root cause for high cholesterol level, high blood level, obesity,  heart and blood vessels disease.

I'd like to suggest you the following dietary regime. You can try it for 1 month, and see the results. I trust this is the sustainable solution to maintain health with regard to the above mentioned list of illness, and also reduces stress in general on your body.

Strike out of your diet: flour (any pastry, bread, pasta...), potatoes and rice. Try to avoid sugar as much as you can.

Your CAN eat, however: sweet potatoes, occasional wild rice, buckwheat.

Also, you can eat red meat, fish, sea food and such, as well as other non-mentioned foods here.

Try to have your food as organic as possible.

This will not take a toll on you once you get used to it, but will significantly promote your health on the long run and most probably lower your cholesterol levels.

If you're taking any drugs currently to maintain your cholesterol level - cautiously apply the diet with your  doctor supervision, as gradual reducing your medications may be required as you progress. Also, if you're above 40 or so, adopt this diet gradually over a period of 7-14 days.

Good luck!

Mor Sagmon