From the Lawrence Daily Journal-World for March 6, 1975:

Nutrition fads are not only dangerous, but are also highly lucrative to those who promote them, according to a Kansas University visitor this week. Leo Lutwak, professor of nutrition at the University of California at Los Angeles, spoke to KU nutrition students this week. “Health food stores are bilking the public out of billions of dollars every year,” Lutwak told students today. “They take five cents worth of useless material and retail it for several dollars. Most food faddists are out to make money, and that’s all…. People are always looking for magic answers to impossible questions through food.” Lack of knowledge can lead people to food fads, Lutwak said, but some trends could be dangerous, such as the overuse of vitamins. “It’s the idea that if a small amount of something is good for you, then a large amount of the same substance will be better,” he explained. “But in the case of some vitamins, while a small amount is good for you, a large amount can be dangerous and even poisonous.” Another current trend, the high protein-high fat diet, could also be harmful, he said, resulting in high cholesterol levels, high blood pressure, and increased loads on the heart and kidneys. “Luckily, people have trouble staying on that diet for more than a couple of weeks at a time, because after that much time, they begin to feel miserable,” Lutwak said.