Ketones have some dieting and weight loss applications, so I guess you could do better real time tracking of how you're digesting carbs and when it's okay to eat? maybe

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hungryhobbit 5 hours ago | parent [-]

They are specifically relevant to trying to enter a fasted state.

The presence or absence of ketones in your blood can tell you whether or not (say) that coffee you just drank took you out of the fasted state (that you were in for not eating overnight).

Whether or not you are in a fasted state matters not just for weight loss, but also for things like longevity (when you are in a fasted state your body cleans up dead cells that contribute to things like cancer, whereas in a non-fasted state it leaves them lying around).

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cperciva 5 hours ago | parent [-]

whether or not (say) that coffee you just drank took you out of the fasted state

A cup of coffee has zero carbohydrates, trace lipids, and about half a gram of protein. That's not going to pull anyone out of a fasting state.

Now, if you're talking about a cup of flavoured milk, that's a different question...

	▲	sroussey 4 hours ago \| parent \| next [-]
		I think I drink coffee but I really drink lattes…
	▲	RHSeeger 4 hours ago \| parent \| prev [-]
		Adding any amount of milk to a coffee adds carbs. And a large number of people add _some_ amount of milk.