by 
The Curious Bag
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There are several hazards to food safety. To ensure that food is safe, take precautions to prevent its contamination by poisonous chemicals or infection with microorganisms.
Microbial Pathogens
If food is improperly stored or incompletely cooked, microorganisms can make you sick, sometimes quite seriously. Proper refrigeration and completely cooking all food can reduce this risk.
Organic Toxins
Organic chemicals such as pesticides and industrial solvents can carry serious health risks. They often end up in food as a result of using contaminated water in cooking. If you suspect that tap or well water in your area is unhealthy, use filtered or bottled water.
Inorganic Toxins
Food may also be contaminated with inorganic toxins such as arsenic, lead or mercury. These metals often come from contaminated water, but can also be found in fish that live in contaminated water.
Radioactive Materials
Food may sometimes become contaminated with radioactive materials, which can cause cancer. This risk applies mostly to plants that grow in contaminated areas.
Prevention/Solution
Most of the hazards to food safety can be avoided by strictly following safe-food handling guidelines. If traveling, especially in less developed areas, check your travel guide for food-safety tips.
Source:
European Food Information Council
North Carolina Cooperative Extension Service: Water Quality and Waste Management
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