1 It's also one of the worst food additives on the market. 2  MSG is an excitotoxin, which means it overexcites your cells to the point of damage or death, causing brain damage to varying degrees, and potentially even triggering or worsening learning disabilities. Common adverse effects linked to regular consumption of MSG, include: obesity, eye damage, headaches, fatigue and disorientation, depression, rapid heartbeat, tingling and numbness. 2  Early studies suggested 25 percent to 30 percent of the US population was intolerant of MSG at levels then found in food.
Sliced deli meats and cheeses on a board. Photo Credit Lawkeeper/iStock/Getty Images. Autolyzed yeast extract is a substance that results when yeast is broken down into its constituent components. It naturally contains free glutamic acid, or monosodium glutamate, and is often used as a less expensive substitute for MSG.f you follow a gluten-free diet you'll need to avoid autolyzed yeast extract because it's a source of hidden gluten, according to Colorado State University. Another possible concern about consuming autolyzed yeast extract is that it naturally contains monosodium glutamate.
Alcoholic Fermentation. There is another way that the NADH molecule can be re-oxidized. Anaerobic conditions in yeast convert pyruvate to carbon dioxide and ethanol. This occurs with the help of the enzyme pyruvate decarboxylase which removes a carbon dioxide molecule from the pyruvate to yield an acetaldehyde.naerobic conditions in yeast convert pyruvate to carbon dioxide and ethanol. This occurs with the help of the enzyme pyruvate decarboxylase which removes a carbon dioxide molecule from the pyruvate to yield an acetaldehyde.