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.
Brewerâs yeast and nutritional yeast are commonly grown specifically to make yeast extract supplements and should be distinguished from baker's yeast, which is a different product made for a different purpose. Supplemental yeast extract can be consumed in liquid form, within food spreads or as powdered capsules. common method for making yeast extract for supplements or food products, such as Vegemite and Marmite, is to add salt to a suspension of yeast. The yeast cells shrivel up and start to break down, especially once heat is added.