Anna Lappe and Bryant Terry speak directly to our conscience in "Grub: Ideas for an Urban Organic Kitchen" (Jeremy P. Tarcher/Penguin), addressing the tired misconception that organic food is a luxury the human race can't afford. In "What to Eat: An Aisle-by-Aisle Guide to Savvy Food Choices and Good Eating" (North Point Press), Marion Nestle deconstructs the typical American supermarket from a nutritionist's point of view, elucidating the maddeningly convoluted means by which our options are determined. And "Real Food: What to Eat and Why" (Bloomsbury), by Nina Planck, poses a convincing alternative to the prevailing dietary guidelines, even those treated as gospel.

The righteous indignation is contagious. As a group, these authors document various aspects of the behind-the-scenes role that politics and big business have played in shaping our food supply. It's infuriating to read Nestle's account of the roadblocks that legislators and lobbyists erected to prevent Country of Origin Labeling (C.O.O.L.), a seemingly straightforward initiative that would allow consumers to know where the food they are buying was grown. And two years after C.O.O.L. went into effect, its implementation is still spotty. As evidence of secrecy and corruption on a scale that brings to mind the Mafia, Nestle cites the 1999 Congressional hearings convened to investigate "slotting fees," introduced in the 1980's "as a way for stores to cover the added costs of dealing with new products: shelving, tracking, inventory and removing products that do not sell." According to Nestle, the industry people who testified "were so afraid of retribution that they wore hoods and used gadgets to prevent voice recognition."

There is no shortage of appalling information here, and the authors all seem to acknowledge that change will come about only by hitting corporate America where it hurts, i.e., the bottom line. Lapp頡nd Terry seem particularly ingenious in this regard. They report that the 10 extra pounds gained by the average American in the 1990's now require the airline industry to use 350 million more gallons of fuel per year, costing an additional $275 million. Their chart comparing food corporations to nations ranks the revenues of Nestl頨Nestea, Lean Cuisine, Stouffer's, Butterfinger, KitKat, PowerBar) and Altria (Nabisco, Kraft, Maxwell House, Post, Jell-O, Kool-Aid, Oscar Mayer) somewhere between the gross domestic products of the United Arab Emirates and Nigeria.

In the course of educating readers, the authors' personalities emerge. There is Nestle, the no-nonsense reporter, at pains to take into account all sides of the story; Weinstein, the evangelist whose zeal sets the tone for his relations with the reader; and Lapp頡nd Terry, earnest New Age hippie types offering menus accompanied by playlists and poems by their friends. (Readers accustomed to a more literary diet should proceed directly to recipes.)

Of the group, it is Planck who is the most companionable. Her capacity for humor and self-deprecation makes for good company, and her intelligence and skepticism inspire confidence. To those who proscribe dairy products on the premise that milk was designed for newborn calves, not humans (a popular, if somewhat bizarre, argument), she retorts that a tomato was designed to make more tomato plants, not pasta sauce. Cataloging her own history, which spans a series of draconian regimens, including vegan, vegetarian, low fat, low saturated fat and low cholesterol, she labels one category "New Foods I Tried to Love" and lists "Various imitation foods made with soy and rice." Planck now eats and, even more outrageously, advocates grass-fed meat and whole dairy products.

Tracking changes in the American diet over the course of a hundred years, she notes that the three most common fats in 1990 - soybean oil, canola oil and cottonseed oil - were unknown in 1890. They are modern inventions. Whereas, she argues, "we've been eating animal fat for three million years." She avoids egg-white omelets and skim milk ("low-quality, incomplete foods") and contends that, where milk is concerned, butterfat facilitates protein digestion and contains the vitamins A and D required for calcium absorption. She recommends "traditional" milk - raw, unpasteurized, unhomogenized - from grass-fed cows, as opposed to those fattened on grain.

Fat, cholesterol, carbs, red meat - none of these, Planck contends, is the problem. Instead, she lays the blame on chemicals and industrial food, including "new" fats, many of which are often hydrogenated. Industrial food, she says, is to blame for the steep rise in rates of disease, especially heart disease, diabetes and cancer. Planck arrives at this incendiary conclusion via Darwin and research into Stone Age eating habits, which flies in the face of widespread myths and confirms that, contrary to popular assumptions, humans used to be more carnivorous, not less. "I doubt that foods we've eaten for millions of years cause cancer," she writes.

Though all these experts challenge the existing order, their advice is often contradictory. Nestle, for instance, questions the premise that a diet high in calcium is best for building bone density, but ratifies current advice to curtail fats and cholesterol. Weinstein suggests albacore tuna as an environmentally responsible choice, but Nestle cautions specifically against it for its high content of methylmercury. Planck suggests soaking dried beans before cooking them; Weinstein insists that this is unnecessary in most cases. And Lapp頡nd Terry endorse cooking with canola oil, one of the very fats that Planck abhors.

Never mind. The zeal that animated sit-ins and antiwar protests in the 1960's hasn't died; it's gone underground, fostering small-scale, sustainable agriculture that undermines industrial food's hegemony. The "Think globally, eat locally" message comes across loud and clear, and these books provide invaluable online resources for information and hard-to-find "real food." Even the most cynical readers will come away from these books determined to change some aspect of their diets, and many people - I, for one - may resolve to revamp their eating habits completely.

Radical as Planck's ideas may be, the case she makes for them strikes me as eminently sensible. I consider myself an enlightened eater, but when I finished her book, I threw out half the contents of my refrigerator, including the soy-based fake bacon bits, the tofu hot dogs and the nonfat sour cream. That was a few weeks ago. It is, I guess, a measure of the extent to which I've bought into all these years of nonfat propaganda that I'm still working up the nerve to eat the skin on my chicken.