No, Everything You've Always Wanted to Know about Energy but Were Too Weak to Ask is not a book about the OPEC or solar heating. It is instead 181 pages about clean habits and a milk shake loaded with vitamins, brewer's yeast, dolomite and lecithin that, the author promises, "can change your life."

Everything is Naura Hayden's answer to what she calls "the human energy crisis." A onetime starlet (previously best known for a long-running RCA color TV set commercial in the '60s, showing her red hair and green eyes), Hayden has neither medical nor literary credentials. "I'm not really a writer," she admits. "I wrote this book exactly the way I talk." Which is to say breezy, a little raunchy and always declarative, if not authoritative. Lousy reviews of the book have not deterred energetic sales, now past 160,000 copies at $5.95 apiece. Aided by a media blitz of self-promotion, Everything has even made the best-seller lists.

Aside from the milk shake, Everything offers commonsense health tips and admonitions against booze, "ciggies," junk foods and other "depression-causing agents. If the body is depressed," says Hayden, who is 5'8", 135 pounds and in her late 30s, "how can you be a loving person?"

"Seven years ago," she recalls, "I did a role on Bonanza. I was smoking a pack a day and drinking 10 cups of coffee. On the last day of shooting my body just conked out." During her recuperation she read nutritionist Adele Davis, concocted the milk shake and revamped her diet. Though she still occasionally craves coffee ice cream, Napoleons and corned beef sandwiches, she says, "If I let myself go, I'd gain 50 pounds." Before her new lifestyle, Hayden claims, "I used to have depressions lasting for days. Now, I'm up all the time. I'm the healthiest person I know."

She proves it as soon as she wakes each morning in the $900-a-month East Side apartment she shares with her second husband, attorney Theodore Geiser. In the buff Hayden performs 20 sit-ups on a slant board, then jogs in place 300 times. Later she flits around Manhattan flogging her book and other projects such as a musical revue she'll star in this summer.

Though born in Los Angeles, Naura has nothing but positive feelings about her adopted hometown, of which she plans to become mayor in 1989. "I'm totally serious," she allows. "I read about New York in the '20s, '30s and '40s when it was really splendiferous. I want to bring it back to those days." Her method? "Imaginative leadership."

Meanwhile Hayden continues her campaign to solve the human energy crisis. Her next weapon may be a candy bar called "Naura's Shment" (nourishment—get it?) which she claims has more protein than three and a half eggs or a quarter pound of steak. She has no doubt that eventually she'll win over the American public. "Persistence, not talent, is the most important thing in life," says Naura Hayden. "You gotta know what you want and go after it."