Microwaves don’t heat food the way an oven does. They don’t just warm everything up evenly from the outside in. Instead, they send out energy that gets absorbed in some spots more than others — and the result is that parts of your food can get piping hot while other parts barely warm up at all.
The turntable is supposed to help with that. And it does, a little. But here’s the thing: even microwave ovens equipped with a turntable can cook unevenly and leave cold spots in food where harmful bacteria can survive. The shape of your food matters. The thickness matters. Whether it’s dense or watery matters. The turntable can’t fix all of that just by spinning.
And microwaves don’t kill bacteria directly — they rely on generating heat to do it. No heat in a spot means no bacteria-killing in that spot. Simple as that.
So if you’re reheating leftovers, a few things actually help. Stir or flip your food halfway through. Let it sit for a minute or two after the microwave stops — the heat keeps spreading during that time. If you can, use a food thermometer to check that leftovers reach 165°F (74°C) all the way through — that’s the temperature the FDA recommends to make sure harmful bacteria are destroyed. And if you’re reheating something thick or dense, give it a little extra time instead of pulling it out the second the timer beeps.