This is a great site for all kinds of basic information with good scientific backup on various foods:
Raw Food Toxins | VegPeace.org
This is why it isn't sufficient to say "oh, I'm sure it's fine if you like the taste" -
"Sweet potato shows trypsin inhibitor activity. That means it contains an enzyme inhibitor that blocks the action of trypsin, an enzyme that digests proteins. The trypsin inhibitor prevents the digestion of protein. Sweet potatoes with higher protein levels have more of the trypsin inhibitor. This makes raw sweet potato difficult to digest. The trypsin inhibitor is deactivated by cooking.
One way the raw food diet helps people is by supplying food enzymes. Food enzymes do part of the work of digesting the raw food. Enzyme inhibitors increase the amount of work that your body needs to do to digest foods. Enzyme inhibitors force your body to produce more digestive enzymes. This uses up resources that could be used to produce detoxifying enzymes. When animals are regularly fed enzyme inhibitors in research, they become sick. Sweet potato should not be eaten raw."
The other info at this link is also really useful. Good luck, and trust your own research and not what someone writes randomly without doing any background work. If you're sitting in front of a computer to ask the question, you can find real answers with just a few clicks.