"Three squares" was a staple of the pre war agrarian lifestyle that most of us lived back then, and persisted on the farm up until recently. (I've seen heavyset farmers, but never obese ones.) It's a fine feeding schedule for folks that need to go a long time between meals because they are way out yonder in the back 40, working their butt off. Literally. But those meals, while they had a pretty fair dose of carbs, also had huge portions of proteins and lipids...bacon, eggs, ham steaks, biscuits and gravy are just a few of the things I remember from my great grandparents breakfast table.
Genetics plays a far larger role in most common health disorders like heart disease than diet possibly can, if you want to avoid heart disease, pick better parents. Having said that, remember that there is a reason for cholesterols in your body, and that you will manufacture the ones you need that you don't eat. I was reminded after developing insulin dependent diabetes that my grandmother always fed us bread, noodles, and cakes to "fatten us up" when I was little.
She didn't feed us fatback, steaks, and fried eggs to do that.
Further, turns out that the government's dietary advice policy was formulated by a vegetarian Democrat staffer to a Senator who famously told nutritional scientists that the government could NOT afford to wait for any evidence that his staffer was wrong. (He obviously did not phrase it thus, but the part about not waiting for good advice is quoted.)
Agenda much?
ETA: One other thing: since becoming insulin dependent, which was also accompanied by an overall improvement in my health (never mind the apparent contradiction there) and an increase in my body weight, I've taken to controlling my weight by controlling my carbohydrate intake. Admittedly it's easier for me to be aware of what it is that I am eating, because I do have to balance carbs with insulin...but I never count calories and I never, EVER go hungry...which lends credence to my belief that the gubmint is responsible for the "obesity epidemic."