I like Rip's take on this as outlined in this simple yet concise comment. Back in 2001, I weighed in at a whopping 135 pounds. That's right, I am 6 feet tall, and at one point I weighed 135 on my doctor's scale, and on the scale at home (I weighed myself every day). And this was indeed intentional. Back then I had a long history of being scrawny and weak. elementary school, junior high, high school ... I just figured I was "programmed to be a relatively tall, skinny guy" ... Thing was, I didn't have a 6 pack, and I wanted to have one, so I could look like the Abercrombie models. So I ate less and less and less. I started skinny, and basically became a wraith.
My sister commented once, back when I started Starting Strength, that even when I was a kid, I never seemed to eat enough. My dad did, too. Said I was "finicky" and only ever ate my breakfast if it was cinnamon toast and milk, and wouldn't eat lunch (always out playing or whatever), and would just pick at dinner...
Had I eaten 3 squares a day, I'd have been bigger, healthier too.
I eat 6 meals a day now, about 4,000 calories total but I worry about getting enough protein and fat more than calories... And I'm 261 now, and today I squatted 345 5 x 3 explosively, and I'm still running advanced novice linear progression.
Oh, and my blood pressure has never been better even with my panda bear-like Power Tummy (which is shrinking).
Point is, nobody is telling you to shovel down twinkies and McDonalds and Wendys and pop tarts... No sir. No way. Some people DO do that to bulk up... Others take a more moderate approach. heh, even at my sloppiest, my excesses weren't fast food most of the time, it was Afghani food, or good Turkish cuisine... Heh, I bet Pocket Hercules knew the healing and uplifting effects of Doner Kebab and Durum ;-) ... What I'm telling you is, add to your existing diet 1 9 to 11 ounce porterhouse steak a day, along with one and a half cups large green olives with some feta cheese and evoo. I bet that helps you recover better, build muscle, and drive the weights up. You need the protein, and sure, you get some saturated fat from the beef, but it isn't necessarily bad for you as long as it's not "modified" and its still nowhere near what you'd get with fried chicken in the case you're worried about it, AND the monounsaturated and polyunsaturated fat in the olives and olive oil are great for you!
So just eat the fucking food and stop agonizing over this.