I managed to get mine down from 6.5 to 4.something with diet. I did it by making up a spread sheet (called the 'low fat spreadsheet'

) to keep to the guidelines for fat and saturated fat. It was dismal. No cheese. I used to end up with a load of calories short at the end of the day, and only wholegrain starch to make it up

Once I bought some chapatis. Normally, if you make them they are virtually no fat, but these took my daily saturated fat allowance over the top

It is surprising what contains saturated fat. Biscuits are bad and wafer ones like kitkats are beyond the pale. It is the only time in my life I have lost weight through diet.

Anyway, I threw in the towel on that one when my vit D tested low and I was wondering about the balance of my diet. There is only so far you can go by replacing creamy pasta sauces with tomatoes, and curry sauces with tomato based ones - you end up eating everything in tomatoes............
I have had my cholesterol tested since, and it has only crept up a little bit and the balance is much better.
Another method I have read about is to make sure your diet contains plenty of the following:
Oats - for the beta glucans. You can also increase soluble fibre.
Almonds - some other nuts are good too, but they do vary in fatty acid balance.
Soya and other beans.
I haven't tried it as the soya is not good for people who have had kidney stones, and I am allergic to the nuts

but I do have plenty oats and other beans.
The other thing to look at is fatty acids. There is a school of thought that too much omega 6 and not enough omega 3 is associated with inflammation and that cutting out saturated fat has not had the effect it should have had because it is easy to replace saturated fat with polyunsaturated that often contains an high proportion of omega 6 fatty acids (sunflower is mostly omega 6). Olive oil is mostly omega 9s which are neutral and is good for sweating onions etc and rapeseed is similar but will take higher temperatures. There are nut oils which may contain more omega 3s, but they usually do not like being heated so are better for salads and dressings.
Omega 6 and 3 fatty acids are used in the proportion you eat them. Ideally, you want a proportion of Omega 6 to Omega 3 of 4:1, but in the modern diet 20:1 is good going. In a non-veg diet fish, esp sardines and pilchards are a good source. Vegetarians need to get it from nuts and seeds - check out the ratios though.