For my own future reference:
Diet is pretty much the same as in my photo from a few months ago except 1) I'm not eating those salads anymore, instead I generally just eat a bag of carrots and a bag of steam-in-bag broccoli or brussel sprouts, and if I'm still craving carbs I'll have another bag of steam-in-bag vegetables or get a box of spinach from the supermarket, 2) I'm generally not eating any fruit anymore, 3) I'm eating a lot of 0% Fage Greek yogurt, like 1-2 medium sized tubs per day, 4) I'm cooking a lot of meat in the microwave, like eggs, chicken, shrimp, salmon, ground beef (93% lean), ground pork (90% lean), ground lamb, flank steak, 5) I'm generally not eating nuts, instead getting my fat from eating ground meat and salmon, 6) I have a square of very dark chocolate (90%) in the mornings as a candy, and I have a single Altoid mint when I wake up and before I go to sleep as a candy.
For my workouts I now go Monday and Thursday evenings, do a 1-mile walk at 4mph, and then for a given day I'll rotate between focusing totally on legs, chest, abs, arms, or back. For each of those I'll try to find 4-5 different weight exercises I can do, and then I do four circuits, with ~10 reps per exercise per circuit (aiming to use a weight so that I can't do more than 10 reps). On the fourth circuit I try to max out and do more reps and/or lower the weight as necessary to totally exhaust the muscle. Another difference is that I've been taking 100mg caffeine (half a caffeine pill) before each workout, which I think has helped me put out a bigger effort. I got that idea from Scooby.
From looking at the difference between this photo and my previous ones, I'd say the difference is attributable to me stopping all my cardio (running, rowing, high rep lower weight workouts) and instead focusing on lifting heavier weights for fewer reps. Also I wasn't doing much if any ab exercises before. I highly recommend reading the Nerd Fitness article on this guy named "Saint".