My diet was the same type of stuff everyone on LC eats: chicken, pork, beef, eggs, cottage cheese, plain Greek yogurt, berries, almonds, whole vegetables, some cheese and milk, black coffee, water... I'm a cook and a baker, so buying premade or prepackaged foods is generally not something I do in the first place.
Like I said, though, sustaining this diet is where the problems arise. My work and schooling involves a lot of eating, sampling, and testing foods that have carbs, sugar, and grains, so any time I managed to go without carbs for a few days, they were temporarily reintroduced soon enough and it leads to a distinct up-down-up-down pattern rather than the total absence that successful LC requires. It doesn't help that I fucking love carbs and the idea of having to cut those out of my life was making me miserable.
I don't believe in demonizing this stuff the way many of you do, and whether you subscribe to the concept or not, moderation (i.e. watching your diet versus restricting your diet) is an effective, sustainable method of losing weight for plenty of people, myself included. I wanted to give low carb a shot after seeing all the huge losses on here, but it doesn't seem to be well-suited for my lifestyle, not to mention I am not dramatically overweight and those are generally the people that get the best results with it.