Right on - a lot of people see weight loss on low carb diets because they're effectively reducing processed food intake. Humans are easily held back from reaching their health goals when eating white bread, chips, white rice, pizza, and other carb-heavy junk food with low nutritional density.
These kinds of diets are fine for quick weight loss, but not sustainable in the long-term. Eliminating your micronutrient intake by cutting out fruits and vegetables from your diet can have serious health effects down the road, if you do this for more than a few weeks or months.