1- Eating and drinking.

2- Whatever takes the role of eating and drinking such as nutritious IV.

3- Vomiting intentionally.

4- Sexual intercourse.

5- ejaculation.

6- Cupping.

7- Menses or post childbirth bleeding. If you do one of the mentioned above, you have nullified your fasting unless you did them due to: ignorance, forgetfulness or forced. But if you were knowledgeable of the ruling, remembering that it is forbidden and choosing to do it with your own free will, your fasting is invalid.

Seven things nullify your fasting.

Fasting | June 11, 2015 7:30 am
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Is it allowed for somebody to just fast for long periods because I was reading a hadith against that with the 3 men. One not sleeping, marrying, and always fasting. Can one just decide to fast for a month and then take a break then fast for another 2 months then take a break and so on?
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If we are fasting mandatory fasting such as Ramadan and we see someone eating or drinking out of forgetfulness, do we tell them or leave them because this forgetfulness is from Allah Subhanahu wa Ta’ala?