Which spoils faster whole or skim milk?

Whole milk contains more fat than skim milk. Fat can become rancid over time, which gives milk a sour taste and smell. Skim milk has less fat, so it takes longer for it to become rancid.

Whole milk also contains more protein than skim milk. Protein can break down over time, which can also cause milk to spoil. Skim milk has less protein, so it takes longer for it to break down.

Finally, whole milk has a higher pH level than skim milk. A higher pH level makes milk more susceptible to bacterial growth. Skim milk has a lower pH level, so it is less likely to grow bacteria.

For all of these reasons, whole milk spoils faster than skim milk.