Tasty yet unhealthy

Why are tasty things always unhealthy? My mom has been following a strict diet plan that made her quit sugar. She was a person who would consume around 12 to 15 cups of coffee throughout the day with considerable amount of sugar in it. And now she being without sugar shocked us all. I questioned her several.times about why she is doing this to herself and she said she wants to go healthy and minus sugar she doesn't feel any difference.

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Can I go without sugar or junk ? Well, I haven't tried, but I think it is not possible for me to do that because I am highly addicted to chocolates and chocolates are synonymous to sugar. I truly appreciate that my mother has been able to achieve a minus sugar living and hope that someday I also would be able to do that.