The diets weren’t just about eating less fat — they also banned butter, added lots of vegetable oil, and cut out eggs, so we don’t know which part actually mattered.

Pro

Against

Evidence from Studies

Supporting (1)

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Evidence from randomised controlled trials did not support the introduction of dietary fat guidelines in 1977 and 1983: a systematic review and meta-analysis

Systematic Review With Meta-Analysis

Human

2015

The study found that the old diet rules changed many things at once — like swapping butter for oil and cutting eggs — but no one knew which change actually helped, and in the end, it didn’t even lower heart disease deaths.

Contradicting (0)

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No contradicting evidence found

Source Study

Evidence from randomised controlled trials did not support the introduction of dietary fat guidelines in 1977 and 1983: a systematic review and meta-analysis

Score: 68

DOI: 10.1136/openhrt-2014-000196

Similar Assertions

The big studies that tried to get people to eat less fat used groups of people who don’t represent the general public and cost too much to roll out to everyone—so they’re not realistic for everyday health programs.

73%

The big studies that tried to get people to eat less fat used weird groups of people and super complicated, costly methods that most health programs can’t actually use for everyone.

72%