Interesting, and slightly dismaying. If true, the HDL/LDL ratio isn’t really important; all that really matters is the absolute LDL level. Still, a high ratio and reduction of total would reduce LDL. But the most important takeaway from a dietary standpoint is that you are not what you eat — there is little correlation between cholesterol intake and serum cholesterol. A failure to understand this over the decades has resulted in a lot of terrible dietary advice, including the kind that probably killed my father in the seventies.
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A point related to the linked article is that a damaged arterial wall is more likely to allow in the LDL particles that start the cascade, in the first place. Which is one more reason to keep blood sugar under control (free glucose can damage proteins) and to keep up the levels of vitamin C and various water-soluble antioxidants such as those found in highly coloured fruits such as red grapes and blackberries.