Argentine Beef for the large part is not injected full of Growth Hormones, Antibiotics and other crap. It is grass-fed meaning it's much much leaner. It has about 1/3 the fat and has a high content of Omega 3 fatty acids. So they say you can actually eat it 3x a week or so. Of course, you'll want to stay away from cuts that are heavier in fat -- this guy's blog has a lot of info on cuts:
http://www.asadoargentina.com/
You need to add in more fish to your diet. Preferably fatty fish like salmon, but I know it can be hard to buy here -- you do see trout more often. Try to eat fish at least twice a week (god, that sounds so sad -- in vancouver I grew up eating fish at least 4 times a week...)
You need to cut out the cheese -- cheese is a big cholesterol no-no. Obviously the aim is to do something that you can follow, so if you can't cut it out, you've got to go lighter on it. No roquefort, no creamy cheeses. The harder the cheese, the lower the fat content. So no sprinkling cheese over your pasta is a good way to start. And cut out / cut down on the pizzas.
Picadas are pretty much a cardiologist's nightmare. Sausages are high in fat and salts giving the double whammy of high cholesterol and high blood pressure, and organ meats, such as liver pates do nothing good for you unfortunately (except a bit of an iron boost, which you're probably already getting from the beef!)
Ice cream: you need to switch to the water-based flavours (the sorbets as we call them in english) -- so no more dulce de leches and tramontinas and chocolates etc... Any of the fruit-based flavours you can usually get in cream or water based.
Milk: switch to skim. You can get omega / fibre-enhanced ones as well. Yogurt: skim ones, activa with fibre is a good idea.
Chips, doritos, things that come in shiny bags -- for the most part are out. You can sometimes buy stuff that is baked, not fried, but check the labels for saturated fat content... if it's not low then put the bag back! Cookies -- there's a couple of brands that are ok -- Frutigrams I believe, again you've got to check for saturated fat. Can't remember if they label Trans Fat here, but a good rule of thumb is: if the product is mass-produced yet always soft and moist or has a creamy filling, then it's full of trans-fat. Unfortunately this is also true of most "freshly baked" goods in any supermercado -- Trans-fat nightmares! It's the partially-hydrogenated oil that's the guilty party. Feel like a junk-foody snack? Buy some popcorn kernals and pop it yourself with corn oil over the stove, or an air popper if they exist here. Avoid microwave popcorn, it's not healthy, usually even when they claim it is!
Chocolates: if there's a filling, not a great idea to have it. Go for the darkest, plainest bars and you can actually give yourself a little antioxident boost.
Olives are high in healthy fats, but you should only eat a few at a time. Avocados are very very good for you -- great Omega source. Almonds are great for you as well. Great source of calcium, Omegas, and even some protein.
Add in Black Beans to your diet. Beans are an almost completely perfect food. They are high in fibre, high in protein, full of nutritional value. You can get canned refried black beans pretty easily here -- usually you can find the NO FAT ones. The others are usually made with lard so while yummy, not so great on the fat. You can buy dried black beans here and make soup really easily.
One of the best things you can do to lower cholesterol is raise your intake of soluble fiber. These fibers essentially attach themselves onto fat going through your system and help uh.... move it on out. 35 grams a day is what you're aiming for... It helps take off the pounds too as you feel fuller faster.
So switch to high fibre breads. You've really got to check the labels here. A lot of "brown breads" in Argentina are still made with refined flours. You don't want this! Look on the labels -- you need Harina Integral. White flour is not high in fibre -- they remove the germ and the the wheat bran and just keep the starch. So you need to go for breads with whole grains. The more grains the better.
Other things you can do -- start your day with oatmeal -- here you have to make sure to buy the Avena Gruesa -- the most unprocessed version you can find. Get it at any Dietetica shop. It usually needs a rinse. Takes 5 mins or so to cook. Don't like oatmeal? Then make it more appealing -- I usually chop an apple and cook it in about a tsp of brown sugar and make the oatmeal in another pot. Then serve them together, it's practically like a dessert. Or add bananas, or frozen blueberries / blackberries / raspberries (usually available at Jumbo) into the oatmeal while cooking. Watch out, the berries will stick so keep stirring them.
Try to do everything in moderation as they say. Anytime you have a meal, have some vegetables with it. Yes I know they are harder to get here, but veggies are good for you -- peppers (morrones) are a super food, and you can always get some of those.
Use olive oil for cooking, except for at high temperatures -- use canola oil / corn oil. Try to cut out the butter, switch to an oleic spread -- there's a tonne of Omega-rich ones around. You can eat eggs, get the Omega-enriched ones.
Also, needless to say, get in some more exercise -- walking's great for you, so if you're already going to the gym etc just start adding in some more walking -- walk a few blocks before getting on the bus etc.
Obviously, high cholesterol and blood pressure runs in my family -- both sides! Heart attacks, bypasses, strokes, oh my! So I know all (or the large majority) of the rules... do I follow them? Not all the time... but even if you do some of the things above -- like switching your dairy, avoiding cheese, you could have an effect.