General tips
Try Organic Food : Organically-grown food costs more, but you get what you pay for. It is 2-10 times richer in minerals, contains no pesticides, and tastes better. It is better for you, your planet, and your palate. Wild unhybridized food is what your body was designed for, before our ancestors started messing with Mother Nature. Take it easy with highly hybridized fruits (bananas, seedless anything) and vegetables (carrots, beets, white potatoes).
Buy Seasonal Food : Most food, from fruit to fish, has a season -a time when it is abundant and at its best. Knowledge about food's seasons was once essential to survival and became culturally ingrained over the centuries. Today, we have all but lost this accumulated wisdom, but it still matters! Buy local and seasonal to guarantee the best quality food you can get.
Buy Local Food : Take a child shopping with you, pick up one of the offending products and say quite loudly "Well we’re not buying that, think of the energy it’s used up just getting here!"
Cooking safety
Dry food before putting it in a deep fat fryer (water can make the oil explode).
Consider using a thermostatically controlled deep fat fryer.