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Even if your blood pressure is normal, cutting back on salt still helps lower it a little—which could help prevent high blood pressure as you get older.
Causal
If you cut salt for just a week or two, your blood pressure doesn’t drop as much as it will if you keep it low for a month or more—it takes time for the full effect to show up.
People who are older, Black or Asian, or already have high blood pressure see a bigger drop in their blood pressure when they cut salt than younger, white, or healthy people do.
For every 1/4 teaspoon of salt you cut out of your diet, your systolic blood pressure drops by about 1 point, and your diastolic by about 1/3 of a point.
Cutting back on salt in your diet lowers your blood pressure—on average, by about 4 points for the top number and 2 points for the bottom number.
Our bodies evolved to handle less than a teaspoon of salt per day, but most people today eat 10 times that much, which may be too much for our systems.
Descriptive
Eating too much salt doesn’t just raise blood pressure—it also makes strokes more likely and heart failure worse.
Even if your blood pressure doesn’t go up, eating too much salt can still make your heart muscle thicker and your arteries stiffer, which is bad for your heart.
Eating too much salt makes your blood pressure go up because your kidneys can't get rid of the extra salt, which is why many people have high blood pressure.
Even though salt is known to trigger inflammation through a protein called SGK1, in these lupus mice, eating a lot of salt didn’t change SGK1 levels in the kidney’s inner part — suggesting this pathway isn’t involved here.
Correlational
When mice with lupus eat a lot of salt, their kidneys make less of a signaling molecule called IL-2, which might reduce inflammation — even though their immune system is more active overall.
When mice with lupus eat a lot of salt, their kidneys release more of a chemical called endothelin-1, but they also make less of the receptor that makes blood vessels tighten — which might help protect their blood pressure.
Even though mice with lupus make more harmful antibodies when eating a lot of salt, their blood pressure and kidney damage don’t get worse than mice eating normal salt.
When mice with a lupus-like disease eat a lot of salt for months, they make more of the harmful antibodies that attack their own body, even though their blood pressure and kidney damage don't get worse.
Cutting back a little on salt — even if you eat a lot now — can help lower blood pressure and reduce the risk of heart attacks and dying early.
Eating too much salt is linked to a thicker heart muscle, more strokes, stiffer blood vessels, and tighter small arteries — all of which can hurt heart health.
People who eat a lot of salt (6-12 grams a day) tend to develop higher blood pressure as they get older, while those who eat very little salt (less than 3 grams) don’t see the same increase.
Eating more salt won't make your blood pressure stay high if you're otherwise healthy.
Women who eat more eggs are less likely to have unhealthy cholesterol levels, but for men, egg intake doesn’t seem to make a difference.
Your body naturally adjusts when you eat more cholesterol — it absorbs less from food and makes less on its own, so your blood cholesterol doesn’t go up.
Mechanistic
Eating cholesterol doesn’t reliably raise bad cholesterol, and when it does, it also raises good cholesterol just as much, so your overall heart risk doesn’t change.
People with high blood pressure who eat lots of eggs live longer than those who don’t — but if they get cholesterol from meat or cheese, they’re more likely to die early.
Eating eggs doesn’t raise bad cholesterol overall, but it makes the good cholesterol bigger and better at cleaning up artery gunk, and turns bad cholesterol into larger, less harmful particles.
If you’re losing weight by eating fewer calories, eating eggs won’t raise your bad cholesterol—even if you’re the type who usually sees a spike.