Whether you can drink milk after fasting depends entirely on the type of fast you're observing.
Types of Fasts and Milk Consumption
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Religious Fasts: Some religious fasts allow for small amounts of certain foods or beverages, including milk. Specific guidelines vary greatly depending on the religion and the specific fast observed. For example, some religious fasts might permit a small amount of milk as part of permitted intake. ([Reference 1: "Only religious fasts are exempted - a cup of milk or a few fruits are allowed in some religious fasts."])
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Intermittent Fasting (IF): For most intermittent fasting protocols, consuming milk breaks the fast because it contains calories (primarily from lactose, a sugar). The amount of calories determines whether it is considered a violation. While small amounts (such as 1-2 teaspoons in coffee or tea) may be acceptable, a full glass would generally be considered a break from the fast. ([Reference 2: "As a general rule of thumb, if you drink something with less than 50 calories, then your body will remain in the fasted state.", Reference 3: "Generally speaking, while fasting with time-restricted intermittent eating, you don't eat any food at all and only drink beverages with very few calories.", Reference 4: "A: Drinking milk during fasting may result in an insulin rise due to lactose, a sugar in dairy products like milk. It can disturb the fasting...", Reference 7: "​Having milk while fasting ... When it comes to milk, you need to be quite careful. Adding 1-2 teaspoons of milk in the tea and coffee is fine as...", Reference 10: "Loading up your cup with high-calorie additives like milk and sugar can disrupt intermittent fasting, limiting the benefits of this dietary..."])
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Medical Fasts (e.g., before surgery or tests): Medical fasts are strictly regulated by healthcare professionals. Milk is typically forbidden before certain medical procedures because it can interfere with the test results or increase the risk of complications during surgery. ([Reference 5: "...can have at least water until 2 hours prior to surgery. ... For that reason, we still ask patients to refrain from drinking milk or eating any...", Reference 8: "You can't have jelly or milk. There are different recommendations for...", Reference 9: "Can you eat or drink water before anesthesia or surgery? Age determines ... Your child may drink milk, formula, or breast milk until 6 hours before the..."])
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Detox Fasts: The rules for a detox fast vary greatly, so always check the guidelines of the specific detox plan. Milk, because of its calories and potential interaction with the detox process, would probably be prohibited.
Conclusion
The permissibility of drinking milk after fasting depends entirely on the context of the fast. Always consult the specific guidelines of your chosen fasting method or your healthcare provider.
