I lost 90 pounds in a year aiming for 1500 calories a day. I didn't do any formal exercise (I'm active at work and I walk about a mile a day with the dogs but no gyms, no real work outs) and there were a couple times I went off plan for a weekend. I'm also over 50, started menopause during that year, and work the graveyard shift - all things that generally make weight loss harder/slower.
So, if you actually exercise and do better than me about being on plan then yeah, 100 pounds is totally doable.
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