We give vitamin K supplementation as an injection in babies following birth to prevent a condition called Hemorrhagic Disease of the Newborn. This devastating condition was, prior to the institution of the supplementation, a significant contributor to infant death, which ravaged society in the pre-twentieth century period. Vitamin K is necessary to make the clotting system in humans work properly. It basically allows clotting factors to be turned on so they can work correctly. As children and adults, we get most of our vitamin K from our diet (eat your green vegetables!) and surprisingly from bacteria, which normally live in your intestines. These bacteria process the components of food which we don’t, and produce the vitamin as benefit to us.

This vitamin dissolves in fat so adults generally store it well. Infants however do not have a good storage or supply of the vitamin. The placenta does not transmit it to the infant well and breast milk has very little vitamin K in it. Newborns also have no bacteria in their intestines to produce the vitamin; so, the end result is, without good storage of this vitamin, infants are at risk for severe bleeding problems. While this can present in the first week of life as bruising and bleeding from the umbilical cord stump, the most devastating effect is bleeding inside the brain which can occur up to 12 weeks after delivery.

Most of this bleeding risk can be avoided with an injection into the muscle of vitamin K at the time of birth. This provides a source of this valuable vitamin to tide the baby over until intestinal bacteria build up enough to produce the vitamin for the baby. As far as dietary sources, breast milk does not encourage the bacteria which produce this vitamin to grow well. Formula is supplemented with vitamin K, but importantly the different sugars in the formula do encourage the bacteria to develop, but it takes time.

Parents often hear stories about the vitamin K injections causing side effects, particularly a risk for cancer later in life (this was related to an old version which had a chemical called phenol in the formulation and never proven even when it was in there), worsening jaundice (again an old formulation used in the mid -twentieth century) and possible liver damage (which can happen from a large overdose, but highly unlikely with the standard amount given to infants).

Some have proposed alternatives methods as the safest and most effective means to administer vitamin K, generally giving the vitamin by mouth to the baby. The big problem with this strategy is absorption of the vitamin is not guaranteed in infants so we have to give a large dose for a long time to do this. With high doses over a long time you do run the risk of getting too much vitamin K and causing liver problems. There are no commercial liquid forms of this drug, so often the injection solution is just fed to the infant. Over the counter vitamins K pills are not well absorbed at all and there is no certainty in these preparations how much vitamin K the infant will get. In a misguided effort to protect their baby from harm, parents end up exposing them to much more risk.

The American Academy of Pediatrics does not recommend oral supplementation, because it has significant risks compared to the simple vitamin K injection, which has proven both safe and very effective to prevent this condition for decades.

About the author

Donald Beam, M.D., is a hematologist and the medical director for the Life After Cancer Program at Cook Children's. Learn more about the Hematology and Oncology Progam at Cook Children's today.

In the field of endocrinology, however, there has been ongoing serious scientific study regarding risk of diabetes and metabolic syndrome linked to artificial sweetener use. Unfortunately, a definite answer hasn’t been reached to this question. One of the primary barriers making scientific investigations difficult is the fact that many of those using AS are already obese and at high risk for diabetes and metabolic syndrome.

A number of theories have been offered by those who believe the link between AS and diabetes/metabolic syndrome is real. Perhaps, those using AS over-estimate the calorie savings from AS and over-eat. Perhaps, the craving for sweetness is increased with AS use leading again to extra sugar-rich calories in the diet. Perhaps, there is premature loss of satiety (that sense of fullness with a meal) when AS is used leading to earlier return of hunger. There are many other theories as well with individuals lining up in support or against the theories.

A newly published article from last month adds more information on the possible link of AS to diabetes/metabolic syndrome. The scientific study investigates the effects of AS in both mice and humans from a unique perspective and made national headlines.

The most provocative part of the article deals with an 11 week investigation in mice. The mice were given artificial sweeteners (saccharin, aspartame, sucralose) along with a regular diet. They were tested at the start and at the end of the experiment. The mice given AS had an abnormal, pre-diabetic response to a large meal of glucose (sugar) compared to mice given water or sugar-water. A smaller number of mice in the study were tested with a combination of saccharin and a high fat diet and showed a pattern of pre-diabetes in blood testing within 5 weeks. The research reported in humans in this study was less compelling and showed pre-diabetes changes in some but not all of the human research participants.  

What was the reason offered by the researchers explaining pre-diabetes changes seen in AS use in their research? Gut microflora and the changes they believe occur in the digestive system from absorbing artificial sweeteners. I know you want to know more about gut microflora, right?

Gut microflora refers to the many kinds of bacteria living the digestive system. Our knowledge about the kinds and roles of these helpful bacteria continues to increase. Scientists have known for a while that these bacteria help make some essential vitamins such as vitamin K and help keep bad bacteria from multiplying too fast.

The research reported drastic changes in the types of gut microflora in all the mice fed artificial sweeteners and in some of the human subjects. The unique theory offered by their research is that changes in the gut microflora caused by AS exposure were responsible for the pre-diabetes seen in the research. In other words, the artificial sweeteners changed the numbers (increasing some and decreasing others) of the many different microflora in the bodies of the mice.

As a pediatric endocrinologist, I welcome the ongoing investigation of the safety of AS use. For many of the children and their parents whom I care for there is a problem. Excess dietary sugar represents a significant fuel to the obesity epidemic and must be managed. Dietary use of AS is almost essential in those with type 1 diabetes to help in maintaining stable blood sugars. For those with type 2 diabetes, AS may help in managing daily calorie intake and reversing obesity.

It is probably overly optimistic to believe that AS are completely without impact on the body. The real ongoing scientific challenge is gaining the proper perspective on their health impact. Proper perspective is very important. For instance, the AS exposure in the mice studied was maximal, which would be comparable to drinking 19 diet drinks per day which is very unnatural.

The big, unanswered question brought up by this research is what could be the long-term effects in those who eat or drink much lower levels of AS. I personally decided within the past year to reduce my AS intake as part of an overall decision to eat healthier. This study doesn’t persuade me yet to eliminate AS completely (I love Diet Coke^® too much). My best advice after reading this article is moderation and continued focus on a healthy diet.