It's three in the morning. Your calf locks up hard.

The muscle is a fist under the skin. You can't point your toes or flex them back. All you can do is grab the bed and wait.

Ask around and you'll get two cures from the kitchen. Eat a banana. Or drink pickle juice.

Both have loyal fans. Only one passed when scientists checked.

Let me show you which is which...

They scanned 12,000 people and found something terrifying

Everyone with vision loss had clogged micro-vessels in their eyes.

Not just an eye problem. A whole-body problem.

The same blockages dimming your sight are cutting oxygen to your heart.

Hazy vision lately? That's your warning about cardiac risk.

Most doctors never make this connection.

Oxford researchers did. Then found a red root technique that clears the blockages.

→ Watch the 2-minute explanation

Vision restores. Heart protected. Some see results in 48 hours.

On September 3, 2000, the Philadelphia Eagles flew to Dallas for their first game of the year. A day earlier, the heat had hit a record 109 degrees.

The Eagles had a trainer named Rick Burkholder. He had a plan that made the players laugh. Before the game, they drank small shots of juice from a pickle jar.

Dallas wilted. Philadelphia won 41 to 14.

The players gave the credit to the pickle juice. Reporters ran with it. And the "Pickle Juice Game" became a legend on sidelines all over the country.

Of course, one game proves nothing. A team can win for a dozen reasons.

But it put a fun question on the table. Can a sour brine really stop a cramp?

First, the older cure. For years, coaches told cramping players to eat a banana.

The idea made sense on paper. Muscles need potassium to work. Bananas have lots of it. So a cramp must mean you're low, and a banana must fill the gap.

A researcher named Kevin Miller decided to check. In 2012, he had nine men ride a bike in the heat for an hour. Then they ate one serving of banana, two servings, or none.

He drew their blood again and again for the next hour.

The potassium barely moved. What little rise there was took 30 to 60 minutes to show up. Most cramps are gone long before that.

Bananas are a fine food. But as a fast fix for a cramp, the math just doesn't work.

Miller had already tested the pickle juice. In 2010, his team in Utah set up a strange test.

Young men worked out until they were a bit dried out. Then the team used a mild electric pulse to bring on a cramp in a small muscle of the big toe. They timed how long it lasted.

Next, they did it again. This time, each man drank a small cup of plain water or pickle juice — about a third of a cup for a grown man.

The result: With pickle juice, the cramp let go in about 85 seconds. With water, it took about 134 seconds. That's close to 49 seconds shorter. The work ran in the journal Medicine & Science in Sports & Exercise.

Here's the twist. The salt in the juice never had time to do anything.

Anything you drink takes far longer than 85 seconds to leave the stomach and reach the blood. And in Miller's tests, blood salt and potassium did not budge. The brine stopped the cramp before it could get anywhere near the leg.

How could a sip work that fast?

The best guess is a reflex. Deep in the back of your mouth and throat sit tiny sensors, packed close together. A sharp, sour taste — the vinegar in the brine — sets them off in a rush.

That rush sends a message down the spinal cord. It seems to calm the nerve cells that keep firing at the stuck muscle. When they quiet down, the muscle lets go.

Think of it like a loud knock at the door. It breaks the loop.

To be clear, this part is still theory. No one has watched it happen step by step. But it fits the clock.

A toe cramp from an electric pulse is not the same as a calf cramp at night. So a team at the University of Michigan tried a real-world test.

They enrolled adults with a long-term liver illness. Painful cramps are common with that illness. The group was 56 years old on average, and each had at least four cramps in the month before.

For four weeks, half took sips of pickle juice when a cramp hit. The other half took sips of tap water. Everyone rated the pain on a scale from 0 to 10.

The pickle group's pain scores fell by about 2.3 points. In the water group, they fell by less than half a point. Results were published in 2022 in The American Journal of Gastroenterology.

Now for the honest part. These are small studies.

The lab test used young men and a toe muscle. Michigan's trial used people with liver illness. Nobody has run a big trial on healthy older adults with night cramps.

The juice made cramps hurt less. But in the Michigan trial, sleep and day-to-day well-being did not improve.

No study shows that a nightly glass prevents cramps. It's a rescue move, not a shield.

Brine is also very salty. If you watch your salt for blood pressure, your heart, or your kidneys, ask your doctor first.

For a long time, many doctors gave quinine pills for night cramps. In 2006, the U.S. Food and Drug Administration pulled the unapproved ones off the market. It later warned against using quinine for leg cramps at all, because the side effects can be serious.

So a sip of something sour is a gentle thing to try. Just keep it small.

Go for a plain, sour dill. Researchers think the tart bite of the vinegar is what triggers the reflex, so the more pucker, the better the odds.

Pour a few spoonfuls of brine into a small cup with a lid. Set it by the bed. A cramp won't wait while you hunt through the fridge in the dark.

After the sip, sit up and pull your toes back toward your shin. Or stand and press the heel of the sore leg into the floor. The stretch and the sip work well as a team.

Back in 2000, the Eagles thought they'd found a secret drink. They were half right.

The brine didn't work the way they guessed. It never got to their muscles in time. Instead, it worked through the mouth, in about a minute and a half.

The banana lost the race. A pickle jar won it on a technicality.

Keep a little sour on hand this week. The next time your calf grabs you in the dark, you'll have more than a prayer to reach for.