It's called inadequate production coupled with the demand for profits. It's getting increasingly difficult to maintain quality food production -- especially for perishables like fruits. So fertilizers are used as are other contaminants like preservatives.
Recently I bought a bag of green grapes. They looked fresh and crisp like they had just been picked off the vine. When I got home I ate three of four. They tasted like chemicals and I ended up with a stomach ache. The store or distributor had dipped the grapes in a preservative -- perhaps too long.
This has changed my buying habits. No longer will I buy any fruit that doesn't have a removable skin on it. Now I buy mostly bananas. And just because a label says "organic" doesn't mean that it is.
The best thing is to minimize your diet. The human body doesn't need much to stay healthy. This will limit what you spend on store-bought foods. Limit the purchase of canned and packaged foods. Grow your own vegetables like tomatoes. This can be done indoors any time of year.
We are being slowly poisoned in the name of profits. If you control what you eat you also control your health.