Bugger the giving up sweets. Some Januaries it works for me, some it doesn't. A week of sleeping like crap and weird hormone-withdrawal weeping/depression completely killed that. Forbidding myself from eating sweets of any kind was depriving me of much needed serotonin. So I ate a lemon poppyseed muffin. Best muffin I've had in ages.
Still haven't used the workout DVDs either.