7 Foods People Used To Think Were Healthy

  • Girl buttering toast, circa 1940s
Girl buttering toast, circa 1940s
Credit: © George Marks—Retrofile RF/Getty Images
Author Kristina Wright

April 9, 2026

Love it?

If you grew up in the 1950s, ’60s, or ’70s, you might remember starting the day with a bowl of frosted cereal and a glass of orange juice, followed by a sandwich on soft white bread for lunch. At the time, packaging and advertisements emphasized that these foods were nutritionally balanced, vitamin-enriched, and backed by modern science.

Many foods promoted as “healthy” in decades past rose to prominence during specific cultural moments: the post-World War II convenience boom, the rise of industrial food processing, and the low-fat movement of the 1970s and ’80s. In each case, marketing often outpaced scientific understanding. Looking back at these former “health foods” reveals how dramatically nutrition advice and public perception can shift over time — and how easily the label of “healthy” can be shaped by trends, rather than evidence.

Credit: © Chaloner Woods—Hulton Archive/Getty Images 

Margarine

Margarine surged in popularity beginning in the 1940s and especially through the 1960s and ’70s, when concerns about heart disease began to enter public consciousness. As early as the ’50s, public health messaging increasingly warned against saturated fats, and margarine — made from vegetable oils — was positioned as the modern, healthier alternative to butter.

Advertising leaned heavily on nutrition science. Packaging and print ads used phrases such as “heart-healthy,” “cholesterol-conscious,” and “made from pure vegetable oils.” Some campaigns featured endorsements from doctors or referenced emerging research about cholesterol, even when that research was still developing or incomplete. Margarine was presented not just as a butter substitute but as a proactive choice for protecting one’s heart.

What consumers didn’t realize was that many early margarines were produced through partial hydrogenation, creating trans fats. These fats were later found to raise LDL (“bad”) cholesterol and lower HDL (“good”) cholesterol — essentially the opposite of what the marketing promised. The widespread use of margarine as a health food was based on a simplified understanding of fat and heart disease, combined with persuasive messaging that emphasized innovation over long-term evidence.

You may also like