Early in the morning, it's easy to reach for the closest food and eat it quickly before running out of the house for work or errands. Some mornings, you might not even have time to grab breakfast at all — I know that happens a lot to me.

Most of us know that breakfast is the most important meal of the day; it jump-starts our metabolism and gets our energy up so we can go about our daily business. Unfortunately, many of us don't have time to eat the breakfast we'd like to every day.

Whether you have an empty stomach after waking up or later in the day, you might just grab a quick snack like a pastry or a fruit. However, those foods may actually not be the best for your stomach.

Read below to find out which foods you should eat and which foods you should avoid on an empty stomach!

Many people love eating oranges or grapefruits first thing in the morning, but they could actually cause problems. The Hearty Soul explains that citrus fruits can irritate your lower esophagus, especially if you eat them on an empty stomach.

This might surprise a lot of people, but bananas are not necessarily the best thing to eat first thing in the morning. According to Brightside, bananas can cause a sharp increase in the amount of magnesium in your bloodstream, which can potentially harm your heart.

I don't know about you, but when I'm trying to have a healthy breakfast, I always gravitate toward yogurt. Apparently, though, I shouldn't be. It's not that eating yogurt on an empty stomach is bad for you, it just doesn't give you all the benefits it can provide if you've already eaten something. The lactic acid bacteria found in yogurt (which is good for you) gets killed by your stomach's hydrochloric acid if you haven't eaten anything else.

Danishes and croissants, although delicious, can cause problems when you eat them on an empty stomach. According to Bright Side, foods like puff pastries and shortcrust contain a type of yeast that irritates the stomach lining, causing flatulence. Pastries also often contain processed sugar, which Lifehack explains can overload the liver.

Grabbing a pear when you're hungry might seem like a healthy choice, but nutritionist Tamara Melton tells Huffington Post that a single fruit won't fill you up. Brightside explains that pears have crude fiber, which can injure the mucous membranes of an empty stomach.

Most of us know we probably shouldn't drink soda for breakfast, but sometimes it's a good source of caffeine when you don't have coffee. The problem with drinking cold carbonated beverages on an empty stomach is that they can damage your stomach's mucous membrane, which slows down your food digestion process.

According to The Hearty Soul, you shouldn't eat tomatoes on an empty stomach, especially if you have acid reflux or stomach ulcers. Tomatoes are high in tannic acid, which can increase the acid levels in your stomach, worsening reflux and causing discomfort.

Many of us don't think to reach for veggies first thing in the morning, but if you do, choose wisely. Raw veggies like cucumbers are without a doubt good for your overall health. However, when you eat them on an empty stomach, they can cause abdominal pain, heartburn, flatulence, and general discomfort.

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