Which bacteria are commonly associated with food spoiling and can also benefit human digestion?

The bacteria that are commonly associated with food spoiling and can also benefit human digestion are Lactobacillus. This genus of bacteria is known for its role in fermenting food, which not only helps preserve the food but also contributes to the growth of beneficial gut bacteria in humans. Lactobacillus species are found in various fermented products like yogurt and sauerkraut, promoting digestive health by enhancing the gut microbiota and improving lactose digestion.

While Bacillus, Clostridium, and Streptococcus may be involved in food spoilage in certain contexts, they do not have the same recognized benefits for human digestion as Lactobacillus. Bacillus can sporadically be beneficial but is more commonly associated with spoilage and pathogenic strains. Clostridium includes species that can cause serious foodborne illnesses rather than promote digestion. Streptococcus includes both harmful and beneficial species, but they don't have the same prominent role in digestion as Lactobacillus. Thus, Lactobacillus stands out for both its contribution to food preservation and its health benefits for human digestion.