It is best not to use the "overnight water" in the tap? The tape used to tie vegetables contains formaldehyde? These rumors are actually true

Whose family group has not seen this situation: the elders enthusiastically share the health knowledge they read on the Internet, and speak very logically; the younger generation immediately refutes it upon hearing it, and also reminds the elders not to blindly believe in rumors. The two sides can't agree, and "family conflicts" are about to break out.

Indeed, it is difficult to tell whether online rumors are true or false, so don’t trust them. But some seemingly fake knowledge is actually true! For example:

Life

1. Is it best not to use overnight tap water for washing or drinking?

Generally speaking, tap water is slightly acidic. If it stays in the faucet for a long time, metal pollutants in the faucet may precipitate and dissolve into the water, causing water pollution, especially for inferior faucets, which is more dangerous.

For example, a CCTV program once conducted an experiment: researchers collected overnight water from the taps of 10 households and sent it to the laboratory for testing. The results showed that the metal pollutant - lead precipitation in the water samples of 3 households exceeded the standard!

Excessive lead can damage the human brain nerves, causing headaches, dizziness, fatigue, etc. Infants and children are more sensitive to lead than adults and are more harmful, which may cause physical and intellectual developmental delays.

Therefore, for safety reasons, on the one hand, it is recommended that you try to choose high-quality faucets; on the other hand, it is best not to use "overnight water" that is retained in the faucet. When you turn on the faucet every morning, you can let it run for a while and use the water to flush the toilet, mop the floor, etc.

2. The tape used to bundle vegetables in supermarkets may contain formaldehyde?

Tape is actually a plastic film coated with adhesive. Due to incomplete polymerization or incomplete evaporation of solvents, there may be a small amount of formaldehyde, benzene and other small molecules left on the tape. But generally don't worry -

On the one hand, although my country currently does not have food-specific tapes in the strict sense, the country has relevant regulations on food contact materials. Therefore, as long as the tape is produced in accordance with the specifications, there will usually not be any major safety issues.

On the other hand, the tape used to tie vegetables is only a small piece, so even if there is formaldehyde residue, the content is very limited. Moreover, formaldehyde is highly water-soluble and volatile, so it is difficult to accumulate on the surface of vegetables, and it can be removed during the process of picking, washing and cooking.

If you are really worried, you can also directly cut off the part that is in contact with the tape.

3. If the paper at the bottom of the thermos is torn, will the insulation effect be greatly reduced?

"When people reach middle age, they have no choice but to soak wolfberries in a thermos cup." Many middle-aged and elderly friends carry a thermos cup with them all year round.

If you observe carefully, you will find that some thermos bottles have a sticker at the bottom. Many friends are accustomed to tearing it off, but this may greatly reduce the insulation effect of the thermos bottle.

This is because thermos cups are generally made of two layers of metal barrels separated by a vacuum. The thermal conductivity of the vacuum is very poor, so the liquid in the liner can be kept warm.

In order to create a vacuum between two layers of metal, there must be a hole to extract the air in between and then seal the hole.

The sticker under the thermos is actually used to plug the hole, which is equivalent to a protective patch. If it is torn off, the vacuum environment between the two layers of metal will no longer exist, and the insulation effect will naturally be poor.

Diet

1. Will eating too much meat cause bad breath?

Meat buns and meat patties in the morning; braised beef and roast duck at noon; fried chicken and boiled pork slices at night... many people can't do without meat for every meal. But eating too much meat can indeed cause bad breath.

This is because the main components of meat are protein and fat. Excessive protein decomposition will produce sulfide, and fat metabolism will produce ketones, which smell like the smell of rotting and fermented fruit. Some of these odors will go to the lower body and become farts; the other part will be exhaled from the mouth and become bad breath.

Therefore, there should be restrictions on eating meat. The "Dietary Guidelines for Chinese Residents 2022" recommends that a total daily intake of 120 to 200 grams of fish, poultry, meat, and eggs is sufficient.

2. Is eating cold rice good for controlling calories and sugar?

When rice is steamed, the amylose in it will absorb water, swell and gelatinize. Therefore, the starch in rice is a fast-digestible starch that can be quickly converted into glucose and used by the human body.

When rice is refrigerated and cooled, part of the starch will be converted into resistant starch. Experiments have shown that after ordinary japonica rice is placed in the refrigerator for 24 hours, the resistant starch content increases from 4% to 14%.

Since resistant starch cannot be digested and absorbed by the small intestine, nor can it be broken down into glucose for use, and its caloric value is only about half of that of fast-digesting starch, eating cold rice does help control sugar and calories.

Of course, this is not to encourage everyone to eat old food. After all, there are so many ways to help control sugar and calories. Why do you have to choose a less fresh way of eating?

3. Is it possible to develop fatty liver by dieting to lose weight?

Nowadays, people generally consider thinness as beauty, so some friends choose to diet in order to lose weight. Not only do they eat less at each meal, but they also eat almost exclusively vegetables and fruits, and avoid staple foods and meat as much as possible.

However, this can easily lead to insufficient protein intake, resulting in a decrease in the synthesis of apolipoproteins in the liver. Apolipoproteins, as the name suggests, are a type of protein responsible for carrying fat. When their number decreases, fat is more likely to accumulate in the liver, and over time, malnutrition-type fatty liver may occur.

According to news reports, there are many people who have developed fatty liver due to dieting.

Medication

1. Will it work faster if I lie on my right side after taking painkillers?

This statement may seem far-fetched, but it actually makes sense.

This is because oral medications usually need to be absorbed through the gastrointestinal tract into the blood, and then reach the corresponding parts through blood circulation to take effect. When lying on the right side, the medication can reach the gastrointestinal tract faster and be absorbed, and the effect will be relatively faster.

2. Will putting eye drops on the eyeball reduce its effectiveness?

Modern people spend all day in front of computers and mobile phones, and eye fatigue, dryness, redness, and soreness are common, so many people always have eye drops on hand. But are you using eye drops correctly?

There are many sensitive nerves on the black eyeball. If you drop the medicine directly on it, you will blink and shed tears, which will cause the medicine to flow away and reduce its effect.

The correct way to do it is: look up, pull open the lower eyelid, drop eye drops on the red conjunctiva of the lower eyelid, and then blink.