It's all about your body. It's unique from mine or anyone else's.
What is drastic to you?
Most of us doing calorie counting (aka: loose WW) combined with a fair bit of exercise, only lose 5-10lbs a month. The more you weigh, the more weight that comes off.
I would suggest light exercise. You don't have to be running marathons or bench pressing your weight to exercise. Most of us do walking programs (like Walk Away The Pounds) and do toning repetitions with 2lb-10lb weights.
Do what you can. Remember, just because you aren't setting out to exercise doesn't mean an opportunity won't present itself. Walk to the store instead of driving, spring clean early, get up and change the channel, etc. And really, if you can do an activity that will get your heart pumping for 20-30 minutes will do your cardiovascular system good, and will help you burn calories