I'm not sure about other parts of the world, but here in the USA, those of us who wish to eat healthy must combat not only terribly long ingredient lists and lots of nutrition confusion but also produce that's laden with PESTICIDES! It's super hard to remember what you MUST buy organic and what is still okay non-organic. Local is usually best.
As the weather improves, the farmer's market comes to town more than just once per month (as in the winter market) and the produce aisles of your local stores begin to show more fruit and veg color than you've seen all winter, keep this in mind.
The CLEAN FIFTEEN and the DIRTY DOZEN - list the safest produce veggie wise as well as the worst. I will NOT eat certain items - or order them at restaurants or eat them at a friends house or consume them at pot lucks no matter WHAT!!! Yes, it's tough. Strawberries have over 90 toxic chemicals sprayed on them, apples likewise.
Here is a link to the lists of good and bad. Copy the link to your smartphone or snap a photo of the pictures of produce and keep them on your phone for easy shopping reference!