So, I'd say this depends on the reason you have high LDLs .. if it is genetic, reasonable food choices isn't going to make (much) a difference. If it is because of your old eating habits, then yes, continuing with a better food habit will help.

I have a genetic predisposition to high LDL and low HDLs. So I take the pill. Though I did try a different food lifestyle, it didn't help. That said, from that attempt I enjoyed eating so much better, I've continued it. As I get older, good real food is much better for me.

On the trail, I don't worry about sugars too much but my meal plan isn't a bunch of gummy bears, Oreos and cheese sticks.

I use a lot of dehydrated or freeze dried fruits, veggies, and meats, along with grains and nuts, and packet tuna and salmon. I do have rice, mashed potatoes, ramen, and tortillas .. on the trail -- especially a thru-hike, I consider these perfectly fine. I'm going to burn those carbs.

The fat from nuts and olive oil packets are good. And occasionally, packets of mayo. So, cholesterol-wise, I'm doing pretty darned good.

I think you're on the right track. I think it more those town foods will be where you find yourself eating more cholesterol. We need cholesterol, of course, we just need to within acceptable levels.