Tofu is a versatile and nutritious ingredient loved by many, especially those following plant-based diets. But like all foods, tofu can go bad, and eating spoiled tofu can cause unpleasant symptoms like stomach cramps or nausea. So, how do you know if tofu is bad? This guide will help you spot the signs of spoiled tofu easily, so you can enjoy it safely and deliciously.
What Happens When Tofu Goes Bad?
Tofu is made from soy milk that’s been coagulated into curds, which means it’s moist and perishable. When tofu spoils, bacteria and mold start to grow, which can change its color, smell, texture, and taste. Consuming bad tofu can lead to food poisoning, so it’s important to recognize the warning signs before cooking or eating it.
Signs Your Tofu Has Gone Bad
1. Smell It
Fresh tofu usually has a very mild or neutral scent. If your tofu smells sour, pungent, or has a strong “off” odor—similar to a “sickly sweet” or rotten smell—it’s a clear sign it’s spoiled. This is often the quickest and easiest way to tell.
2. Look at the Color
Good tofu is creamy white or pale in color. If you notice your tofu turning tan, yellow, or brown, it’s likely past its prime. Also, visible mold—fuzzy spots or discoloration—is a definite no-go and means you should throw it away immediately.
3. Check the Texture
Fresh tofu should feel firm or soft but not slimy. Spoiled tofu often develops a slimy or sticky surface because of bacterial growth. If the tofu feels clotted, mushy, or rubbery in an unusual way, it’s best to discard it.
4. Taste a Tiny Bit (Only If It Passes Other Tests)
If your tofu passes the smell, look, and texture tests but you’re still unsure, you can taste a small piece. Spoiled tofu will taste sour or strange, unlike the bland flavor of fresh tofu. If it tastes off, spit it out and don’t use it.
5. Check the Package
If the tofu package is bloated or swollen, that’s a sign bacteria inside are producing gas, and the tofu is likely spoiled. Also, always check the expiration or “sell by” date. Even if unopened, tofu doesn’t last forever—usually about 2-3 months in the pantry and 3-5 days in the fridge once opened.
How to Store Tofu to Keep It Fresh Longer
– Keep it refrigerated: Store tofu in the fridge as soon as you bring it home.
– Use water storage: Once opened, keep tofu submerged in fresh water in an airtight container and change the water daily to keep it fresh for up to 3-5 days.
– Freeze for longer storage: Freezing tofu extends its shelf life for several months but changes its texture, making it chewier and more porous—great for some recipes but not all.
– Avoid leaving tofu out: Don’t leave tofu at room temperature for extended periods, as it spoils faster.
Why Proper Tofu Storage Matters
Tofu is a healthy protein source packed with essential amino acids and minerals like calcium and iron. But once it spoils, it can cause foodborne illness with symptoms like nausea, vomiting, and fever. Proper storage and timely use ensure you enjoy tofu’s benefits without risk.
Quick Tips to Remember
– Always trust your senses—smell, sight, and touch are your best tools.
– Don’t consume tofu past its expiration date or if the package is swollen.
– Store tofu in water and change the water daily after opening.
– Freeze tofu if you want to keep it longer but expect a texture change.
– When in doubt, throw it out!
Tofu is a fantastic ingredient when fresh, but it doesn’t last forever. By keeping an eye (and nose) out for these signs, you’ll always know if your tofu is safe to eat or if it’s time to toss it. Enjoy your tofu dishes with confidence and good health!