The Health Effects of Food Additives: Exploring Monosodium Glutamate and Phosphorus Preservatives

Welcome to the Nutrition Facts Podcast! I’m your host, Dr. Michael Greger. In today’s episode, we delve into the health effects of food additives, particularly focusing on monosodium glutamate (MSG) and phosphorus preservatives. As we explore these topics, it becomes clear that understanding what we consume can significantly impact our health.

Monosodium Glutamate: Menace, Myth, or Marvel?

Monosodium glutamate, commonly known as MSG, has long been a controversial food additive. Initially implicated in the so-called "Chinese Restaurant Syndrome"—characterized by symptoms such as numbness, weakness, and palpitations—MSG has faced scrutiny since a letter was published in the New England Journal of Medicine in 1968.

However, recent studies challenge the negative perception surrounding MSG. A multicenter, double-blind, placebo-controlled trial involving 130 self-reported MSG-reactive volunteers revealed that only two individuals experienced symptoms after being given MSG in capsule form, suggesting that taste may influence the perception of adverse reactions.

Despite some concerns, consensus meetings in 1997 and 2007 concluded that MSG is harmless, and the European Food Safety Authority’s 2017 evaluation found that most people exceed the set limit of 30 mg per kilogram of body weight per day without adverse effects. Given its ability to reduce sodium intake significantly—by up to 30%—MSG could serve as a valuable tool in promoting heart health.

The Hidden Dangers of Phosphorus Preservatives

Phosphorus preservatives, particularly those found in processed and junk foods, present another layer of concern. Excessive phosphorus intake has been linked to negative health outcomes, including damage to blood vessels, accelerated aging, osteoporosis, and an increased risk of heart attacks and mortality.

Interestingly, while the average requirement for phosphorus is less than 600 mg per day, many individuals in the United States consume nearly double that amount. The bioavailability of phosphorus from plant foods is generally lower than from animal sources, making plant-based diets a preferable option for managing phosphorus levels.

Phosphate additives are particularly concerning, as they are absorbed nearly 100% by the body. These additives are commonly found in cola drinks and injected into meats to enhance color and preserve quality. While consumers may perceive these products as higher quality, the hidden dangers of elevated phosphorus levels can affect everyone, not just those with kidney issues.

Conclusion

As we investigate the implications of food additives like MSG and phosphorus preservatives, it becomes evident that awareness and informed choices play crucial roles in our health. Understanding the effects of these compounds can lead to better dietary practices, promoting overall health and well-being.

For further insights, visit NutritionFacts.org for more podcast episodes and resources. Remember, all proceeds from my books—How Not to Die, How Not to Diet, and How Not to Age—go to charity, and there are no ads or sponsorships on the site.