Sugar is bad. Keto makes it easy: no sugar, no carbs. It's the "easiness" of the diet that gains its converts.
Thing is, it's really just the sugar that's bad. Sugar, from the most natural of honey to HFCS is human-kind's most efficient calorie.
Sure, if you told someone "no candy, no sweets, no soda, no juice" they'd probably still want to eat a ton of a fruit or pineapple.
My in-laws don't eat sweets. They do eat tons of pasta and bread. They havent had much success in losing weight, despite a restrictive diet, mostly because they eat so much bread and pasta, and they never exercise. If you're someone who is constantly moving, carbs are good for you. If you're someone burning tons of calories, then sugar is ok too. If you're not doing either, then neither is probably good.
Me? I saw it first hand. When I was in college working for a summer at a YMCA Summer Camp, I swore off sugar. None in coffee. No soda. Nothing at home. The only place I allowed it was in the dining hall at work (I got 2 free meals). It was amazing how despite the occasional cookie, cake or ice cream, I still lost weight really quickly. Granted, being a groundskeeper also helped, but in 3 months I lost almost 35lbs.
Now, with a less active job and a 8-month old, I'm struggling. It's just too easy to eat. The last 3 months in particular have been bad. Lots of vists by family, lots of free food at work, lots of free sweets at work.
Amazingly enough, a weird thing has happened lately - I'm finding stuff too sweet. I have ice cream in the freezer at home. I'm not interested in it. We have soda at work. I'm not interested. It's weird, and actually kind of worrying. Has my body hit it's limit?