A single teaspoon of mayonnaise contains around 90-100 calories. Yep, you read that right - just one little teaspoon can pack a serious calorie punch! And if you're thinking, "But wait, I use way more than that on my sandwiches!", then you might want to rethink your mayo game.
Now, you might be wondering why mayonnaise is so calorie-dense. Well, it's because it's made from a mixture of oil, egg yolks, and vinegar or lemon juice - all of which are high in calories. But hey, who doesn't love a good mayo-based sauce every now and then?
Interestingly, mayonnaise is also super high in fat - we're talking around 10 grams per teaspoon! But don't worry, some of that fat is actually good for you (think omega-3s and all that jazz). So, while mayo might not be the healthiest condiment out there, it's not all bad either.