I won't repeat anything about the transfats (hydrogenated fats) in peanut butter. But I will add something about the nutritional value of natural peanut butter. Peanuts are not truly members of the nut family. They are legumes, like peas and beans, and contain the same nutritional benefits. But they are naturally high in fats (where do you think all of the peanut oil comes from?
) And thoug that fat is mostly mono, and poly-unsaturate, it is stiff a fat, which means that it is calorie intense and can lead to high triglycerides, and weight gain if too much es eaten.
Fortunately, most of us smear a tbs. or so on our bread and add whatever we add. That won't be enough to cause any problems and will add fiber and protien to your diet. Peanut butter, used wisely, is a great and nutritious food.
And jelly, if you opt for the sugarless varieties, are high in the natural vitamins and minerals common to fresh fruit. The thing to remember is that in the jelled for (jams too), you are getting more fruit than you would normally eat in a serving. But again, if you use a single tbs. or so in your sandwich, the health benefits far outweigh any sugar intake. Again you get the soluble fibers, vitamins, isoflavones, etc. All of this is good stuff.
Use whole grain breads for extra flavor, texture, and nutrition. You will find that if you aren't used to it, the flavor will be strong. But after a couple of days, if you are like the great majority of us, it will soon become the preffered flavor over store-bought white bread (truly boring stuff).
So the short answer is, yes, PBJ's are good for you, if you eat the real thing.
Seeeeeya; Goodweed of the North