In one sentence, describe what the following article is about:

Vegans do not eat any animal products, and only eat foods from plant sources. This means that vegans do not eat meat, fish, eggs, or dairy products. Instead, they eat fruits, vegetables, grains, nuts, and seeds. A raw diet is where you eat living, uncooked plant-based foods, like vegetables, fruits, seeds, and nuts. On a raw diet, no food is heated over 118F. Instead, foods are eaten fresh, dehydrated, or fermented. This is done because some believe that cooking food destroys helpful enzymes and destroy the nutritional value of the food. Vegan diets are very healthy, though vegans have to ensure that they get sufficient amounts of nutrients that are easily obtained from animal products. People who follow a raw vegan diet can have problems getting nutrients like protein, iron, calcium, zinc, selenium, vitamin K, vitamin B12, and omega-3 essential fatty acids. Studies have indicated that raw vegan diets can increase the risk of bone loss, osteopenia (soft bones), and osteoporosis (brittle bones). Some women on raw vegan diets lack enough fat to make estrogen and may cease having periods and become infertile. While a vegan diet can be recommended if the person knows that they have to get enough nutrients, a raw vegan diet is not recommended, especially for children, the elderly, and those with chronic conditions. Children raised on raw vegan diets are at serious risks for certain problems, like growth delays, developmental delays, and neurological disorders. This occurs because the nutrients that the diet makes so difficult to obtain in sufficient amounts are those that are most critical in growth and development, along with a healthy nervous and immune system. There have been reports of babies, infants, and small children dying of malnutrition and vitamin deficiencies. Though it varies for each individual, the average person requires about 2,000 calories per day for a healthy, functioning body. Because the elements of a raw vegan diet are extremely low in calories, you may need to each much larger quantities to hit 2,000 calories. At bare minimum, women should eat at least 1,200 calories a day, 1,800 for men. This is the bare minimum necessary to survive, but you may suffer significant impairments including fatigue, diarrhea, constipation, gallstones, a slowed metabolism, muscle loss, and cognitive impairment.
Understand what it means to be vegan. Understand a raw diet. Learn the general risks. Know the risk for children. Know that a raw vegan diet requires more food to obtain adequate calories.