**Explanation:**

**Why can't we taste food properly when we have a cold?**

When we have a cold, our sense of taste is often affected. This is because our ability to taste food is closely linked to our sense of smell. Here's why:

**1. The link between taste and smell:**

Our sense of taste is not solely determined by our taste buds on the tongue. In fact, around 90% of what we perceive as taste actually comes from our sense of smell. When we eat food, aromatic molecules are released, which travel through the back of our throat to the olfactory receptors in our nose. These receptors then send signals to our brain, allowing us to perceive flavors.

**2. The impact of a cold on our sense of smell:**

When we have a cold, our nasal passages become congested due to inflammation caused by the viral infection. This congestion hinders the flow of air and prevents the aromatic molecules from reaching the olfactory receptors in our nose. As a result, our sense of smell is significantly reduced.

**3. The role of smell in taste perception:**

Without a fully functioning sense of smell, our ability to taste food is greatly diminished. Many flavors and nuances that we typically perceive when eating are a result of the combined input from our taste buds and sense of smell. For example, the aroma of freshly baked bread or the scent of a ripe fruit enhances our perception of its taste. Without the olfactory input, our taste buds can only detect basic sensations like sweet, sour, salty, bitter, and umami.

**4. The effect on taste perception:**

When we cannot fully smell the food we eat, our perception of taste is significantly altered. The food may taste dull, bland, or even flavorless. This can lead to a reduced appetite and a decreased enjoyment of eating.

**Conclusion:**

In conclusion, when we have a cold, our sense of taste is affected because our ability to smell the food is diminished. As a result, we are unable to fully perceive the flavors and aromas of the food, leading to a reduced taste experience.