Not all carbs are bad. That should be clear. In fact, one could live off of starch if one had too, it’s been done before. But in the short term, sugar restriction is the best way to lose weight.
Some of my favorite foods are carbs, and I eat them every day. Things like brown rice, apples, oats, lemons, bananas, etc… are all good carbs. The real trick is to eat wholesome, unprocessed foods and not man made garbage. Just eat natural food and your health will return.
Since the low carb diet is popular now, that is how athletes and bodybuilders get ripped in the short run, people are avoiding carbs entirely. But that is not smart. Carbs like whole grain and fruit are actually full of fiber and antioxidants, and since grain is cheap, it is easy to sustain yourself on very little money.
It is a precarious balance, between ingesting sugar/starch and burning it off through cardiovascular exercise. It is important to get in enough water too so you are not low energy and sluggish.
Ultimately, it’s about calories in and calories out, and fat has the most calories per gram. The low carb fad will die out, and people will realize that any natural food is good food, and all these restrictions are just academic in the end.