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Because the USDA doesn't certify fish, it's not usually identified as organic or nonorganic. Some fish, like salmon, are identified as farm-raised or wild, and in this case wild is your best bet. Most food experts and nutritionists agree that wild fish are both better tasting and more nutritious because of their natural and varied diet.

Many people are concerned about harmful mercury in fish. "All fish contain mercury but some more than others," says Dr. Fuhrman. The most contaminated varieties are tilefish, white snapper, shark, mackerel, swordfish and tuna. The least contaminated: flounder, tilapia, sole and trout. It's best to limit your intake of contaminated fish varieties to one serving per week, less if you're pregnant or nursing.

A Guide to Organic Grain, Meat, Dairy and Fish

Grains
"Like the other food groups, if you have access to organic grains and can afford them, I believe organic is better than conventional and always for the same reason: You're exposing yourself to fewer environmental contaminants with organic," says Dr. Hobbs. Another plus: Most organic grain products are healthy whole grains.

Meat and Dairy
When it comes to animal fats like meat and dairy products, you may want to consider going organic, but limiting your intake of animal fats overall is your healthiest move.

"The higher-fat animal products are also those that deliver the most toxicity to us. I recommend that people eat fewer animal products and opt for lower-fat versions which are less contaminated and are probably better for us anyway," says Dr. Fuhrman.

"For example, instead of foods like cheese and butter, get your fat from healthier sources such as nuts, seeds and avocados." Adds Dr. Hobbs, "If you can afford it, you're better off buying organic meat but at the same time, you should reduce the frequency of meats, regardless of whether they're organic or conventional."

When eating meat, you can cut your chemical exposure by removing as much of the fat as you can since that's where chemicals are likely concentrated, says Holewinski.

It's Okay to Buy These Nonorganic Fruits and Vegetables

• Asparagus
• Avocados
• Bananas
• Broccoli
• Cauliflower
• Corn (sweet)
• Kiwi
• Mangoes
• Onions

Buy These Organic Fruits and Vegetables

• Apples
• Bell peppers
• Celery
• Cherries
• Imported grapes
• Nectarines
• Peaches
• Pears
• Potatoes
• Red raspberries
• Spinach
• Strawberries

A Guide to Organic Fruits and Veggies

Fruits and Vegetables
When it comes to fresh fruit and veggies, the best thing you can do is to eat more of them -- organic or not. "If you're not eating enough fruits and vegetables overall, then buying organic is like worrying about pennies but not dollars," says Suzanne Havala Hobbs, DrPH, RD, clinical assistant professor in the department of health policy and administration at the School of Public Health at the University of North Carolina at Chapel Hill.

Joel Fuhrman, MD, author of Eat to Live and Disease-Proof Your Child, agrees. "Pesticides are not the main factor in determining things like cancer, heart disease and diabetes. The main factor is that the American diet gets less than 10 percent of calories from fresh fruits and vegetables, beans, nuts and seeds."

That said, "there is some justifiable concern that chemicals are potentially harmful," says Dr. Fuhrman, "but you don't have to eat completely organic. If you avoid the 12 most contaminated fruits and vegetables, you can eliminate more than 90 percent of your pesticide exposure."

What Does Organic Really Mean?

Organic foods are produced with little or no synthetic fertilizers or pesticides and are free of added antibiotics or hormones. In order to be called organic, a product must be certified by the United States Department of Agriculture. Don't confuse "organic" with "natural" though. "There's no legal definition of a natural food," says Terrie Holewinski, RD, a cardiovascular dietitian at the University of Michigan Health System. "The food industry often uses the term 'natural' to mean minimally processed or preservative-free."

So are certified organic foods better for you than conventional foods? "At this point, there is no scientific evidence that organic foods are healthier or safer than conventionally grown foods," says Holewinski. But it's hard to identify the long-term effects of the pesticides, fertilizers and other chemicals that are found in so many of our foods.

Do organic foods taste better? Some fans of organic say their food definitely tastes better. But the taste difference could be linked to other factors like the season and growing conditions.

So when should you splurge on organic, and when is it safe to save your money? This guide to the food groups can help you decide.