section_path: Nutrition and health
section_name: Nutrition and health
paragraph_text: Nutrition and health
  
  The composition of milk differs widely among species. Factors such as the type of protein; the proportion of protein, fat, and sugar; the levels of various vitamins and minerals; and the size of the butterfat globules, and the strength of the curd are among those that may vary. For example:
  
  Donkey and horse milk have the lowest fat content, while the milk of seals and whales may contain more than 50% fat.