Health Claims

Even if you eat a lot more or a lot less salt for a week, your body still pees out about the same amount of potassium — your kidneys keep potassium steady no matter how much salt you consume.

Causal

When rats eat too much salt, their body releases a hormone that tightens blood vessels — blocking that hormone’s effect cuts the blood pressure rise in half.

Quantitative

Too much salt doesn’t make the brain’s salt pump work harder — it just turns off the main salt-removing valve (KCC2), causing neurons to get overexcited.

Quantitative

Salt makes brain cells release a chemical called BDNF, which turns off a safety switch (KCC2) that normally calms down blood pressure neurons — blocking BDNF stops this from happening.

Mechanistic

When rats eat too much salt, the brain cells that release a hormone to raise blood pressure start firing faster, and this directly causes their blood pressure to go up.

Quantitative

When rats had a part of their brain (SFO) removed, they kept less salt in their bodies during the first few days of eating a very salty diet, meaning that part of the brain might help the body decide how much salt to hold onto.

Causal

Cutting out a small part of the rat’s brain called the SFO didn’t change their blood pressure, even when they ate a lot more or a lot less salt than normal.

Descriptive

Eating a lot of salt for a week makes your daytime blood pressure go up a tiny bit — but your nighttime pressure and overall 24-hour pressure don’t change.

Causal

When you eat little salt, your kidneys rely more on a specific channel (ENaC) to hold onto sodium — so blocking it with amiloride makes you pee out a lot more salt. When you eat a lot of salt, that channel isn’t as important, and another part of the kidney (DCT) handles most of the sodium.

Causal

When people eat a lot of salt, their kidneys use a specific part (the DCT) to reabsorb more sodium — so when you give them a diuretic like hydrochlorothiazide, it works way better at making them pee out salt.

Causal

When rats had a part of their brain (SFO) removed, they kept less salt in their bodies during the first few days of eating a very salty diet, meaning that part of the brain helps control how the body handles extra salt.

Causal

Cutting out a small part of the rat's brain called the SFO didn't change their blood pressure, even when they ate a lot more or a lot less salt than normal.

Descriptive

In rats, male kidneys make more endothelin-1 when they eat salt—but in humans, it’s the opposite: female kidneys make more. This shows we can’t just assume animal results apply to people.

Descriptive

Women’s kidneys respond to eating a lot of salt by making more endothelin-1—a substance that helps flush out salt—but men’s kidneys don’t make more of it, even when they eat the same amount.

Causal

Even when people who don’t get high blood pressure from salt eat a lot more salt for 10 days, their blood pressure doesn’t go up—no matter if they’re a man or a woman.

Causal

When people who don’t get high blood pressure from salt eat more or less salt, their kidneys adjust how much salt they pee out—no matter if they’re male or female.

Causal

When women who are healthy and not menopausal eat a lot more salt for 10 days, their kidneys release more of a substance called endothelin-1 to help flush out the extra salt—but men’s kidneys don’t do this same thing.

Causal

When healthy young men eat a lot of salt for a week, their daytime blood pressure goes up a tiny bit — but their nighttime pressure and overall 24-hour pressure don’t change, meaning their bodies mostly handle the salt fine.

Causal

When you eat a lot of salt, your kidneys use the first part of the filtering tube (DCT) to hold onto sodium; when you eat little salt, they switch to a different part (collecting duct) that’s controlled by a hormone called aldosterone.

Mechanistic

When healthy young men eat a lot of salt, their kidneys use the part of the tubule that thiazide drugs target to reabsorb more sodium — so when you give them a thiazide, it works way better at making them pee out salt.

Causal

When healthy young men eat a lot more salt for a week, their kidneys filter blood faster — not because their blood pressure goes up, but because their kidneys just work harder to get rid of the extra salt.

Causal

Even if you eat a lot more or a lot less salt for a week, your body still pees out about the same amount of potassium — your kidneys handle potassium on their own, not by following how much salt you eat.

Causal

When healthy young men eat a lot of salt, their daytime blood pressure goes up a little — about 4 mmHg — but their nighttime pressure and overall 24-hour pressure don’t change.

Causal

When healthy young men eat very little salt, their kidneys rely more on a specific sodium pump (ENaC) in the final part of the kidney to hold onto sodium — and blocking that pump removes as much sodium as blocking the earlier pump.

Causal