Types of food dating
The usually quoted rule of thumb is that chemical reactions double their rate for each temperature increase of 10 °C (18 °F) because activation energy barriers are more easily surmounted at higher temperatures.However, as with many rules of thumb, there are many caveats and exceptions.Most medications continue to be effective and safe for a time after the expiration date. Food and Drug Administration covered over 100 drugs, prescription and over-the-counter.A rare exception is a case of renal tubular acidosis purportedly caused by expired tetracycline. The study showed that about 90% of them were safe and effective as long as 15 years past their expiration dates.The SLEP discovered that drugs such as Cipro remained effective nine years after their shelf life, and, as a cost-saving measure, the US military routinely uses a wide range of SLEP tested products past their official shelf life if drugs have been stored properly.Preservatives and antioxidants may be incorporated into some food and drug products to extend their shelf life.Shelf-life is not to be confused with service-life (defined as, A general term used to quantify the average or standard life expectancy of an item or equipment while in use.
The concept of expiration date is related but legally distinct in some jurisdictions.However, improper storage of milk may result in bacterial contamination or spoilage before the expiration date.The expiration date of pharmaceuticals specifies the date the manufacturer guarantees the full potency and safety of a drug.For some foods, health issues are important in determining shelf life.
Bacterial contaminants are ubiquitous, and foods left unused too long will often be contaminated by substantial amounts of bacterial colonies and become dangerous to eat, leading to food poisoning.Joel Davis, a former FDA expiration-date compliance chief, said that with a handful of exceptions - notably nitroglycerin, insulin and some liquid antibiotics - most expired drugs are probably effective., and drug manufacturers have economic and liability incentives to specify shorter shelf lives so that consumers are encouraged to discard and repurchase products. Food and Drug Administration (FDA) refused to issue guidelines based on SLEP research for normal marketing of pharmaceuticals even though the FDA performed the study.One major exception is the Shelf Life Extension Program (SLEP) of the U. Department of Defense (Do D), which commissioned a major study of drug efficacy from the FDA starting in the mid-1980s. The SLEP and FDA signed a memorandum that scientific data could not be shared with the public, public health departments, other government agencies, and drug manufacturers.Shelf life is the recommended maximum time for which products or fresh (harvested) produce can be stored, during which the defined quality of a specified proportion of the goods remains acceptable under expected (or specified) conditions of distribution, storage and display. High-acid canned foods (tomatoes, fruits) will keep their best quality for 12 to 18 months; low-acid canned foods (meats, vegetables) for 2 to 5 years. A product that has passed its shelf life might still be safe, but quality is no longer guaranteed.