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One analysis found as many as 13 different pesticides on strawberries.

By now, we all know there’s a benefit to buying some stuff organic. But these days you’re faced with the option of getting everything organic—from fruits and veggies to mattresses and clothing. You want to do right by your body, for sure, but going the all-natural route en masse can be pricey.

So we wondered: What’s really essential for our health? That’s why we came up with this definitive list. Here’s what should be in your cart—and what you don’t have to worry about.

Read more: 11 things you should buy organic

There are numerous reasons why we should choose organic. Organic food in Australia if often more expensive than non-organic, but the more you know about the overall benefits of organic food, the more you will realise it is much better value.

Read more here: Why choose Organic?

Fruits and veggies are an essential part of a healthy diet, but many conventional varieties contain pesticide residues.

And not all the pesticides used to kill bugs, grubs, or fungus on the farm washes off under the tap at home. Government tests show which fruits and vegetables, prepared typically at home, still have a pesticide residue.

You can reduce your exposure to pesticides by as much as 80% if you avoiding the most contaminated foods in the grocery store.

Read more here: The new Dirty Dozen: 12 foods to eat organic and avoid pesticide residue

Feeling pressured to go green at the grocery store? The good news is you don’t have to go 100% organic in order to eat healthier. And it pays to get smarter about just what you’re getting for your money. Organic foods are grown without synthetic pesticides and chemical fertilizers. “That means fewer chemical residues get into the environment and your body,” says Marion Nestle, Ph.D., a food researcher at New York University and author of What to Eat. But it also means they’re pricier—costing anywhere from 10 to 100 percent more—than conventional produce.

So what’s a cash- and health-conscious person to do? The answer isn’t to simply opt for organic no matter what. Not all conventionally grown foods are smothered with chemicals. So all you really need to do to protect your health, the planet, and your wallet is focus on buying just a few key organic foods. A good rule of thumb: “If you’re going to eat the skin, consider organics,” says MF adviser Tanya Zuckerbrot, R.D., a New York-based dietitian and author. “But if you can peel the fruit or vegetable, you’re going to strip away a lot of the residues anyway—so it’s not really worth the extra money.”

Read more: Is ‘Organic’ Worth It?