Yes. Low fat products generally have more sugar in them than the normal products.

Foods such as fruits, vegetables, whole grain foods, and low fat or non fat dairy products, are naturally low in fat.

Low fat products aren't bad to look into. But people don't gain weight just because of a product having "fat". You tend to put on more fat/weight from a product with higher amount of sugar. The best products to look into are the ones with low sugar content. But low fat products are not a bad thing though, but you don't want to just eliminate fat, because your body needs a little bit a fat.

Some fat substitutes can prevent absorption of fat-soluble vitamins.

Some fat substitutes can prevent absorption of fat-soluble vitamins.