I have been on a low carbohydrate diet for 15+ years.  I eat all I want! Some times more than is comfortable.  I am down more than 25 LB starting at 208 LB. I just choose foods that are low in nonfiber carbohydrates. I did not start the low carbohydrate diet to lose weight, that was just a side effect. Long ago I was able to lose weight by limiting my calories intake but eventually the weight comes back.  
I have been using Claritin since it became an over the counter drug.  For several years I would use it for several months each year.  I noticed that after I had been using it for about one month my knees stopped hurting and my limp went away.  I have been taking one pill a day for the past 5 years and my knees are better than they were 20 years ago.  I don’t take it for my knees, that is just a side effect.  I have never been able to lose weight by exercise but doing exercise before a trip makes it so I can do the trip easier.  
MagicPaddler