Why freshness doesn't reduce the core danger
Overnight exposure might make you worry about bacterial growth, but nutmeg's toxicity doesn't degrade with time—the myristicin remains fully active regardless of cookie freshness. While mold could theoretically add stomach upset, it pales next to the guaranteed neurological risk from even stale nutmeg. Your cat's 5 kg body can't neutralize these compounds like humans do.
The cookie's sugar and fat content actually increase the risk by encouraging more thorough licking than plain spice would. Your cat likely ingested more nutmeg than you'd estimate because the sweet carrier masked the spice's bitterness. Watch for symptoms based on the cookie's original nutmeg content, not its overnight condition.
How preparation form changes absorption
Baked nutmeg in cookies isn't safer than raw powder—heat doesn't destroy myristicin. In fact, the fat in baked goods may enhance toxin absorption compared to dry spice. Your cat's single lick could deliver more bioavailable toxin than an equivalent amount of pure powder would, thanks to the butter or oils binding the compounds.
The cookie's moisture content also matters. While dry spices often stick to cats' mouths uneaten, the damp cookie base allowed efficient ingestion. Don't assume she spat it out—the appealing texture likely ensured full tongue contact. Monitor as if she consumed the full visible amount, not just what's missing from the cookie.
Why neurological symptoms trump digestive ones
If your cat vomits, it's tempting to blame cookie spoilage—but nutmeg toxicity causes vomiting through central nervous system disruption, not simple stomach irritation. Watch the sequence carefully: nutmeg-induced vomiting typically follows (not precedes) other neurological signs like pupil dilation or twitching whiskers.
Her 5 kg size puts her at particular risk for rapid symptom progression. Unlike larger animals who might show gradual warning signs, cats often pivot abruptly from seeming fine to severe distress. Note any changes in blink rate or tail movements—subtle neurological indicators often appear before obvious stumbling.
The critical 12-hour observation window
Myristicin's effects typically manifest within 12 hours but can appear deceptively mild at first. Your cat might simply seem "off"—not napping in her usual spot, or reacting slowly to sounds. These soft signs matter more than dramatic collapse with nutmeg toxicity in cats.
Keep her in a confined, padded space to prevent injury if seizures develop. Avoid the temptation to offer food or milk—unlike some toxins, nutmeg's dangers aren't mitigated by stomach contents. Note exact timing of any symptoms; this helps veterinarians predict whether the worst has passed or more severe effects are still coming.
The full verdict, portion guidance and serving notes are collected on the Nutmeg food facts page.