Exercise can make you feel full, sometimes, yes. It has to do with releasing... hormones or chemicals or something. Though if you exercise a lot, you should get hungry with your body needing fuel. I guess it's more to regulate appetite. And, people do vary.
As far as not eating enough calories, I think that's not uncommon for when a person changes to healthier eating. I've found that too, that at first I feel like I'm eating all the time and gosh isn't that a lot of food. Then, for me, that feeling drifts away as I fall into a routine. I guess it's the change of nutrients and fiber and water and all of that making the changes.
We're about the same weight, and my general rule of thumb is not to try not to go below 1200 calories (more or less, I do points because I'm on Weight Watchers) on days I'm not feeling hungry. I've had a string of "not hungry" days lately, which might be because of some medicine I'm on. But if not, regardless, I know that I eventually get cravings or hungry and then I eat more. So this time around I'm not worrying about it too much.
Though if you're just eating 1000 calories, or less, and it's more than a day or two, that might be a cause for concern. I'd definitely take a multivitamin. If you're not hungry and not eating much, be sure to make your calories count, nutrient-wise, and get a healthy balance. See how your weight reacts. And you can always go and talk to your doctor. I'd give it a week before you start worrying too much, though, personally.
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