100 votes

Can a person survive on blood in place of water?

Blood is not a good source of water. 1 liter of blood contains about 800 mL of water, 170 grams of protein and 2 grams of sodium (calculated from the composition of lamb blood). When metabolized, 170 ...
  • 8,029
18 votes

Can a person survive on blood in place of water?

You can drink blood of course to a minimalistic amount (eg- a few teaspoons ) and also if blood is free from pathogens. But it should always be in very small amounts and from suitable donor. Here's ...
  • 559
17 votes
Accepted

What inactivates pepsin in infants?

EDIT: Thanks a lot to @abukaj for pointing out the mistake in my answer (and to @paracetamol for asking such a beautiful question). I am rewriting my answer to incorporate the (hopefully) correct ...
16 votes
Accepted

Why does mouldy food make you sick?

One of the most common toxins in mouldy food/bread is aflatoxin. The exposure to high amount of aflatoxin can lead to acute aflatoxicosis with fulminant hepatic failure and even death. While mild ...
  • 5,650
11 votes

How is satiety measured?

Satiety is complex, and there are several kinds of satiety, all of which come into play in different circumstances. Things that decrease or halt our eating are called satiety signals. Different ...
10 votes

Does freezing microorganisms such as probiotics kill them?

Yes, they do. For a look at survival of Lactobacillus and other bacterial species after multiple freeze/thaw cycles, check out Harrison 1955 (below). The awesome hand-drawn graphs show that many ...
  • 3,318
10 votes
Accepted

How can heart disease cause dizziness after eating?

Dizziness after eating, which can lead to falls and passing out, is called postprandial hypotension, and as the heart is indeed responsible for responding to hypotension by increasing it's rate - ...
10 votes

Can a person survive on blood in place of water?

Here is a specific account of a person surviving at sea drinking turtle blood, while eating some fish and drinking some rain water. Several peoples have a habit of drinking raw animal blood, at least ...
9 votes

Is lemon water an alkalizing agent in the body?

Short Answer: There was an interesting paper that dealt with the pH of urine when citric acid was consumed. The summary was: There was no increase in urinary pH or total nitrogen in 24 hours ...
  • 3,030
9 votes
Accepted

Does inhaling glue (glue sniffing) reduce appetite?

Short answer Various inhalants, most notably organic solvents including those used in paint and glue suppress appetite. Background From the Division of Alcohol and Drug Abuse I learned the following: ...
  • 51.8k
8 votes

Will a 0.2g/mL sugar concentration cause vomiting in humans?

Sugar (be it sucrose, glucose, fructose or honey) does not have emetic properties in any concentration, unless there is a personal (and highly individual) psychological adverse reaction to sweet ...
7 votes

Are nutrients absorbed in human esophagus?

For several reasons, I seriously doubt that this has been studied extensively. There is a good reason to study absorption through oral mucosa because a drug or glucose can be held there by people who ...
7 votes
Accepted

Do intestinal flora have the same DNA as their host?

Could you suggest a good source for beginners. - Louis Somers The interactions between the human body and its microbiome are quite complex. I am going to provide you with an answer that will be based ...
  • 4,965
7 votes
Accepted

What is a lethal dose of THC?

According to the abstract from this paper, the intragastric LD50 of $\Delta^9THC$ (tetrahydrocannabinol) in sesame oil using Fischer rats was 1270 mg/kg. Assuming rats and humans are identical (they'...
  • 15.1k
7 votes
Accepted

What are the consequences of drinking water with food?

A moderate amount of water while eating will not dilute digestion ...according to Michael F. Picco, M.D. and the Mayo Clinic: There's no concern that water will dilute the digestive juices or ...
7 votes
Accepted

Do humans produce rennin?

Scanning various reviews it seems that everyone who mentions the possibility of a human chymosin refers to a single paper. So for example this 2014 review has a single reference to a human chymosin: ...
  • 22.7k
7 votes
Accepted

Why can't humans digest dietary fiber when we can digest starch?

"starches are held together with A bonds, dietary fibers are held together with B bonds, and the enzymes only work to break A bonds for X reason" What you wrote here is correct. ...
  • 15.1k
6 votes
Accepted

Can swallowed fingermails, hair, or skin get caught in your appendix?

Skin is safe to chew, and digestible. Fingernails are not digestible, so really shouldn't be swallowed if avoidable. In the medical literature, there are at least 225 cases of foreign bodies in the ...
6 votes

Why does mouldy food make you sick?

Here's a bit of additional information (Although there's an answer from Ilan that satisfied you.) Is it the mould itself that makes us sick or is it something that the mould is releasing? What are ...
  • 531
6 votes
Accepted

Influence of eating at late night on sleep

According to Crispim et al 2011, caloric intake late at night is correlated negatively with sleep quality: We conclude that food intake during the nocturnal period is correlated with negative ...
  • 3,318
6 votes
Accepted

How does horse extract the energy to needs from a relatively small digestive system?

The digestive system of a horse is by no means small: They have 15 to 21 m (50 to 70 ft) of small intestine, with a capacity of 38 to 45 L. They have a 1.2 m (4 ft) long caecum that holds 26 to 30 L. ...
  • 2,472
6 votes
Accepted

Why do gram-negative bacteria attack the digestive system more than gram-positive ones?

Gastrointestinal infections can be caused by Gram positive and negative bacteria: Gram-positive: Staphylococcus aureus Clostridium difficile, botulinum and perfringens Listeria monocytogenes ...
  • 8,029
5 votes

Is lemon water an alkalizing agent in the body?

The excellent answers from Chris and One Face have already written about why the claim is wrong, so I'm going to add a hypothesis for how this sort of nonsense could even originate in the first place. ...
  • 360
5 votes
Accepted

Betaine HCl stomach pH

Betaine HCl (trimethylglycine) was present in over the counter "stomach acidifiers" but the US FDA says there is no evidence for its efficacy and has banned its use for this indication (source: US FDA)...
  • 39.2k
5 votes

In which organs is water that we drink absorbed into the blood?

Role of the stomach in water absorption: The absorption of much of the ingested water from a hypotonic food already starts in the stomach due to osmotic reasons. If we study the mechanism of secretion ...
  • 1,955
5 votes

Can Fluoride be absorbed into the blood from within the mouth without swallowing?

Although I'm having a hard time finding a source that provides specific information on fluoride in toothpaste, this review explains that fluoride is most readily absorbed through intestinal epithelia ...
  • 1,879
5 votes

Do humans produce rennin?

I think the answer is really that is isn't clear, though I only searched a bit and found mostly old papers. It seems like people have found immunoreactivity to anti-rennin antibodies in human infants,...
  • 39.2k
5 votes
Accepted

Why porifera is classified to have an incomplete digestive system although it has no organs?

An incomplete digestive system is one in which there is only one opening. In our digestive system food is taken in by one opening (our mouth), the nutrients extracted and the remains are ejected by ...
  • 192
4 votes
Accepted

How does botulinum toxin enter the blood stream from the digestive tract?

Transcytosis is a process by which large macromolecules are transported across a cell, such as those in the intestinal epithelium. It is used by many toxins and even whole organisms to enter the body. ...
  • 17.6k

Only top scored, non community-wiki answers of a minimum length are eligible