While it's true that pasteurized milk is generally safe to consume before its expiration date if the container remains unopened, it is important to note that the taste and quality of the milk can deteriorate over time. The expiration date indicates the period during which the milk is expected to retain its optimal flavor and quality. Consuming milk that is past its expiration date or has developed a sour taste is not advisable for a few reasons:

1. Taste: As milk ages, it undergoes chemical changes that can result in an unpleasant taste. The milk may taste sour, bitter, or rancid, making it unpalatable.

2. Spoilage: Even if milk appears and smells fine, it can still be spoiled and contain harmful bacteria. These bacteria may not always produce noticeable changes in smell or appearance but can still lead to foodborne illnesses.

3. Digestive issues: Consuming expired or sour milk can cause gastrointestinal discomfort, including stomachache, bloating, nausea, vomiting, and diarrhea. These symptoms are more likely to occur if the milk contains high levels of harmful bacteria.

It's crucial to follow the expiration dates on milk containers and use your senses to assess the quality of the milk before consuming it. If the milk has passed its expiration date or has an off-putting taste, it is best to discard it to avoid potential health risks.
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