We all know that we should include more raw food in our daily diet such as fresh fruits and vegetables. But some foods, even some vegetables, can be toxic in their undercooked state, says nutritionist Tara Collingwood, MS, RDN.

“Many foods can be dangerous when eaten raw,” the team dietitian for the Orlando Magic basketball team tells Newsmax. “For example, eggplant contains solanine, a poisonous compound that can cause vomiting, diarrhea and damage to the central nervous system and needs to be cooked. Animal protein in general — dairy, poultry, pork and eggs — can be very dangerous when eaten raw because of the bacteria and parasites that can be found in these foods.”

Here are six foods that should never be eaten raw:

1. Cookie dough. We’ve all been guilty of licking the bowl, but the Centers for Disease Control and Prevention issued a formal warning titled “Say No to Raw Dough!” urging folks NOT to yield to temptation and indulge. Raw dough contains flour and often eggs, both products that can harbor harmful germs and bacteria in their uncooked states.
2. Potatoes. This vegetable, like eggplant, contains solanine. Green potatoes are particularly high in solanine and can be toxic even when cooked, according to Prevention. When you bake potatoes in a casserole or stew, make sure they are thoroughly cooked.
3. Sprouts. Adding bean sprouts to salads is a great way to jazz up the meal, but uncooked sprouts can contain harmful bacteria, such as salmonella and E. Coli.
4. Steak tartare. As delicious as this gourmet dish of raw ground beef mixed with eggs dish appears, that’s how dangerous it can be. The Academy of Nutrition and Dietetics says on its website, Eatright.org, that we should never consume rare or even medium rare meat because in the grinding process, harmful bacteria on the surface gets ground into the meat. Ground meat needs to cooked to an internal temperate of 160 F.
5. Raw milk. Drinking raw milk has become trendy as many people believe it can cure many diseases, but Collingwood warns it’s a health hazard. “Drinking unpasteurized milk can be dangerous because of the bacteria it can contain,” she says.
6. Raw asparagus. This is another vegetable that should be cooked even though it’s not toxic, according to Alternative Daily. Cooking enhances the cancer-fighting antioxidants in this vegetable and increased the absorption of vital nutrients like vitamins A, B, C, E, and K. Cooking will also help break down the fiber making it more easily digestible.

“While you may have eaten raw cookie dough or steak tartare without incident in the past, all it takes is one time that you willnews get sick and it can be potentially deadly, especially for someone with a compromised immune system,” says Collingwood.