<human>:  What are the pros and cons of a vegan diet?
<bot>: 

Pros:
 A vegan diet has been linked to lower risk of chronic diseases such as heart disease, diabetes, and certain types of cancer. Vegans also tend to have lower Body Mass Index (BMI), lower cholesterol and reduced risk of developing hypertension. Additionally, vegan diets protect the environment by limiting water and land use, reducing animal by-products, and helping to reduce global warming.

Cons:
 A vegan diet requires a lot of planning and may require more effort than other diets to ensure that all essential nutrients are consumed. Nutrient deficiencies such as iron, zinc, vitamin D, and B-12 vitamins are more frequent and need to be addressed for proper health. Additionally, a vegan diet may be expensive.