Why can't vegetarians eat anything with enzymes?!

PoodBear's answer is wrong. Animals, yeast, bacteria, plants, viruses, prions, protozoans, etc. make enzymes.
Yes, vegetarians can. But, they can't eat enzymes made from animals like rennet, casein, whey, etc.
And yes, proteins are enzymes.
Cheese-making is disgusting. Don't eat it.

Enzymes are chemicals that are produced by a body (be it yours, or an animal's) to break down the food it's eaten so it can be used. If you lack the proper enzyme, you won't be able to break down or digest certain foods. People who are lactose intolerant, for instance, are unable to eat dairy because their body doesn't produce the proper enzymes. This is also how many artificial sweeteners works - we don't have that enzyme, so the whole thing just goes in one end and out the other...

I guess the idea of consuming something that contains enzymes that were harvested from an animal would not necessarily be vegetarian, since the only way to get these are from organs like the liver or gall bladder.

However there are now artificial enzymes that are created in test tubes and don't involve animals at all, so these should be considered OK for both vegetarians and vegans.

wtf... Girl listen to me, and then go research enzymes if you're skeptical. Enzymes are 3 types of Enzymes: metabolic enzymes, digestive enzymes, and food enzymes.

Digestive enzymes aid in the digestion of food and the absorption and delivery of nutrients throughout the body. The most commonly known digestive enzymes are secreted from the pancreas into the stomach and small intestine. Each enzyme is specific to a particular compound which it breaks or synthesizes. The 3 most important enzymes for digestion are protease, which digests protein; amylase, which digests carbohydrates; and lipase, which digests fat.

Food enzymes are derived solely from raw fruits, vegetables, and supplemental sources. Like digestive enzymes, they enable the body to digest the food by breaking down the various nutrients -- proteins, fats, carbohydrates, and vitamins and minerals - into smallest compounds that the body can absorb. They are absolutely essential in maintaining optimal health.

Overwhelming evidence shows that food enzymes play an important role by predigesting food in the upper stomach. Supplementation of food enzymes is necessary today because so much of the food is processed or cooked.

Most food enzymes are destroyed at the temperatures used to cook and process food. Food enzymes are extremely sensitive to temperatures above 118 °F. When raw foods are processed or heated in any way, they may lose 100% of their enzymes activity and up to 85% of their vitamin content.

Unfortunately, even the raw food might be enzyme-deficient if it was grown in nutrient-lacking soil.
Coenzymes

To function properly, food enzymes must also work in tandem with the coenzymes of vitamins and minerals. Unlike the enzymes in raw plant foods, coenzymes are not completely destroyed by cooking. Unless the enzymes from raw food are present, the coenzymes in the food cannot be utilized to their full potential.

For all these reasons, supplementing with enzymes is crucial to achieving a more efficient digestive process and better absorption of food's nutrients.

When an animal has an enzyme deficiency, it develops many health problems. These include digestive disturbances, constipation, gas, bloating, colon problems, excess body fat, and problems as serious as heart disease. Enzyme deficiencies have been linked to premature aging and degenerative diseases as well. In fact, studies have shown that diets deficient in enzymes can cause a 30% reduction in life span. Cancer research has discovered that certain enzymes are absent in the blood and urine of many cancer patients. Lack of enzymes and the resulting malabsorption of nutrients can also cause allergic reactions, poor healing of wounds, and skin problems.

Enzyme supplements help create more energy, promote faster and easier digestion, and encourage superior nutrient absorption. The animal's digestive system works best when enzyme supplements assist in setting the nutrients free for the body to absorb and use.

Other types of enzymes include: DNA Repair Enzymes, DNA Restriction-Modification Enzymes, DNA, Catalytic, Immobilized Enzymes, Holoenzymes, Hydrolases, Isoenzymes, Isomerases, Ligases, Lyases, Multienzyme Complexes, Oxidoreductases, Penicillin-Binding Proteins, Recombinases, Catalytic RNA, Transferases.

my bachelors in nutrition

Enzymes is kind of like the label "natural flavoring." You can't be 100% sure it's from a vegetarian source or from, say, pork fat.

You do need enzymes. They occur in your body and in raw food. Vegetarians can eat enzymes.

They can,

papaya, pineapple.