The Claim
Between 1979 and 1992, the annual percentage decline in ischemic heart disease mortality among adults aged 30–69 years was significantly smaller in Tokyo and Osaka prefectures than during 1969–1978, while no decline occurred in the rest of Japan during the same period.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
From 1979 to 1992, the rate at which deaths from ischemic heart disease decreased slowed down in Tokyo and Osaka compared to the previous decade, but did not decrease at all in other parts of Japan.
See the scientific wording
From 1969 to 1992, the annual percentage decline in ischemic heart disease mortality among adults aged 30–69 years was significantly smaller in Tokyo and Osaka prefectures during 1979–1992 compared to 1969–1978, while no decline was observed in the rest of Japan during the same period.
As people in Tokyo and Osaka ate more fatty foods and salt after 1979, their arteries stopped clearing out plaque as quickly, so heart attacks and deaths from blocked arteries fell more slowly than before. In other parts of Japan, people kept eating the same low-fat, low-salt diet, so their arteries kept clearing plaque and heart disease deaths kept falling.
What the research says
1 studyIn Tokyo and Osaka, heart disease deaths stopped falling as fast after 1979, while in the rest of Japan, they stopped falling altogether. The study confirms this exact pattern.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.