In my teenage years, I would be stricken by violent stomach upsets every Motzei Shabbos, and I didn't know from what. Experimentally I tried whole wheat challah, and they went away.
White flour is a scary being.
White flour is stripped of the most nutrient-rich parts of the grain. It also is processed in a way which makes it instantly absorbed when it reaches the intestine. Unlike whole grains-which take a much longer time to be digested, absorbed, and broken down into energy, white flour immediately raises your blood sugar levels, much in the same way sugar does.
That means that after you eat it, your body has two choices: either burn it off immediately, or store it as fat. Usually, unless you are working out while eating your flour tortilla, that means that it is stored as fat.
Lastly, because of the instant elevation of your blood sugar level (which is also shown to be unhealthy), the later instant drop of your blood sugar will likely leave you hungry. White flour and sugar are very similar in the ways they effect our energy, bodies and health. Both can be major contributors to weight gain.
If your diet is filled with a lot of white flour, you are likely missing out on some major nutrition necessities, and feeling very hungry a lot of the time. It's OK to have a little now and then, but it's much better for your health and your waistline to eat whole grains instead. - Answers.com
Due to recent years whole wheat awareness, there are many, many products available.
Whole wheat lokshen is now available in supermarkets, and by kosher brands.
For cakes, I use whole wheat pastry flour. The only brand that I have found to be light and airy enough is Arrowhead Mills Organic Pastry Flour (it's carried my local kosher supermarket, and Shoprite, to my knowledge).
Be aware that when baking with whole wheat flour, baking powder should be omitted. I found that out the hard way, after cleaning out the oven after repeated overflows. The resulting cake has a great dimension, and is filling in its own right, meaning that unlike white flour cakes, I can actually say, "I've had enough."
I adore this cereal: Barbara's Bakery Shredded Oats. It's delicious, despite the name; I buy it from a nearby Trader Joe's. It passes the real test: the kiddies love it as well as the whole wheat cake. It's currently my picky nephew's main food supply.
Favorite Matzoh: Kemach Whole Wheat Matzohs.
Favorite cracker? Landau's. The ones that are hexagon-shaped.
Practically all wheat-based products are available in whole wheat nowadays; I've even found soup croutons. But being whole wheat doesn't automatically make it healthy; still check the nutritional facts for fat, sugar, and fiber content (less of the first two, more of the last).