Yeah, it's been tough getting enough calories, but I've been doing okay for the most part. I can definitely tell when I'm not eating enough calories (feel very worn out, get dizzy easily). I used to eat a low fat diet, so I've been eating more fats, which is helping to up my calorie intake.
My job is a cleaner, cleaning apartments, so I'm very active during the day. I also used to work out 3 times a week at the gym (cardio and weight lifting), but I haven't been since I started eating low carb. I've been going for short walks (about 1/2 a mile) a few times a week now. Once my body gets a little more used to the low carb eating (I still don't feel all that energetic), I'm going to up my exercising.