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Artificial Sweeteners: Is Aspartame Safe?

Note: This was originally published as a “SkepDoc” column in Skeptic magazine under the title “Aspartame: Safe Sweetener or Perilous Poison?” and is reprinted here with the kind permission of Michael Shermer. There are other artificial sweeteners not specifically addressed here, but as far as I know there are no convincing health concerns about any of them, just this same kind of hype and fearmongering based on animal studies and speculation with no validation from human clinical studies.


Aspartame is a low calorie sugar substitute marketed under brand names like Equal and Nutrasweet. It is a combination of two amino acids: L-aspartic acid and L-phenylalanine. It is available as individual packets for adding to foods and it is a component of many diet soft drinks and other reduced-calorie foods. Depending on who you listen to, it is either a safe aid to weight loss and diabetes control or it is evil incarnate, a deadly poison that is devastating the health of consumers.

A reader sent me an ad from his local newspaper that recommended using stevia instead of aspartame and made these startling claims about aspartame:

  1. It is derived from the excrement of genetically modified E. coli bacteria
  2. Upon ingestion, it breaks down into aspartic acid, phenylalanine, methanol, formaldehyde, and formic acid.
  3. It accounts for over 75% of the adverse reactions to food additives reported to the FDA each year including seizures, migraines, dizzinesss, nausea, muscle spasms, weight gain, depression, fatigue, irritability, heart palpitations, breathing difficulties, anxiety, tinnitus, schizophrenia and death.

Let’s look at those claims one by one.
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Posted in: Herbs & Supplements, Nutrition

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