Sounds good but potatoes are fattening, they are full of starch. If you are trying to lose weight stay away from them. You can eat a very small portion of mashed potatoes but I would avoid it completely since they don't even have good nutrition and you don't feel satisfied after eating it.
It's unfortunate
you don't feel satisfied after eating a potato. I wonder how you are preparing them. I know the traditional method was boiling, but there are much tastier ways to cook your food. A baked potato, for example, can be very flavorful when combined with a good blend of spices and herbs, and perhaps a vegetable puree as a dressing.
Potatoes
are high in starch, but have you looked at what other nutrients they contain? For a large russet potato (weighing in at 2/3 lbs and only 300 calories), you can expect about 1/8 of your protein requirements, a whole host of B-vitamins, over half the recommended daily value of vitamin C, and significant levels of iron, magnesium, phosphorus, potassium, copper, and manganese. People don't usually talk about fiber, but this tuber has about 7 grams of it (the W.H.O recommends getting at least 25 grams of fiber).
I wouldn't be so hasty to say potatoes are fattening. If you do some research on how your body actually produces fat, you might find that in general, you have to have an excess of calories. The starch (or any bioavailable carbohydrate) will be used as the primary energy source for your body to carry out metabolic processes. If all you ate was a baked potato as your breakfast, two baked potatoes for lunch, and three baked potatoes for dinner, you would still be loosing fat since you likely didn't hit your calories required for your daily metabolism (unless you are a small person or child). Of course, don't follow this diet as you would be bored of it by dinner, and you would lack other micronutrients not covered in potatoes.
I would suggest further research into nutrition if you really want to know how to get healthy. Body fat is only one factor. You can start with that, but don't confine yourself to only one arena.