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Not only will it quell an upset stomach, it may also help protect your brain. 

Alzheimer's develops from buildup of proteins call beta-amyloid and tau (also known as plaque and tangles). The accumulation over time of these proteins causes the neurons to die and eventually shuts down brain functions.

The two active compounds in cinnamon that have shown to prevent the build up of beta-amyloid in mice, are called cinnamaldehyde and epicatechin.  

Cinnamaldehyde gives cinnamon its sweet smell and prevents oxidative stress from reaching the tau proteins. It blocks the oxidative stress, cinnamaldehyde keeps neurons alive and healthy. Epicatechin is also a powerful antioxidant that protects your brain from oxidative stress. If you want to know what oxidative stress is, watch this very short video here. 

Oxidative stress is a major factor when it comes to Alzheimer's and brain cells. If you can preven oxidative stress and free radicals from destroying neurons and otherwise healthy cells, you can prevent or delay the onset of the disease. And that's exactly what cinnamon can do.

The studies of cinnamon were done in vitro and mice. But you don't have to wait for results of human clinical trials to add this protective spice to your meals.

Other things you can to to improve this condition are: eliminate sugar, grain, and sweets. Use only coconut oil and olive oil, and animal fats (butter from raw milk, fats from organic animals).  Do not use canola oil, corn oil, margarine, and other vegetable oils (except olive oil and coconut oil).

Sources & References: 

 http://institutefornaturalhealing.com/2013/06/the-sweet-and-savory-spice-that-prevents-alzheimers/#References
 http://www.ncbi.nlm.nih.gov/pubmed/23531502
 http://physrev.physiology.org/content/84/2/361.full