Why do humans have such a weak digestive system?
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On the other hand, if a dog eats one ounce of a dark chocolate bar, it will become very sick, and likely die. A dog also cannot drink milk without significant intestinal problems, but at least some humans can. read more
With the availability of fire, human guts no longer had to carry out some of these digestive functions, and humans evolved to lose those functions, freeing the energy and resources once used for this purpose for other things, like growing and maintaining a bigger brain. read more
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Source: betterliving.co
Further Research
Diet for a Weak Digestive System
www.livestrong.com
Surprising Symptoms of Poor Digestion
lifespa.com
Your Digestive System & How it Works
www.niddk.nih.gov