Peanut butter is a fan-favorite nut butter, evident in the number of food products we put it in. We spread it on toast and put it in cookies, smoothies, sauces and sandwiches. There’s even a National Peanut Butter and Jelly Day – April 2, if you’re thinking about celebrating – to proclaim we're nuts for peanuts.

The world of nut butter has expanded considerably in the 21st century to provide options for people who are allergic to peanuts and new options for snacking.

Here’s what a registered dietitian has to say about the various health benefits.

Which nut butter is the healthiest?

While all nut butters are going to provide the healthy fat, fiber and protein as their whole nut counterparts, there’s one option that sticks out among the rest, says registered dietitian Danielle Crumble Smith. 

Almond butter is high in Vitamin E, a powerful antioxidant that 88.5% of Americans don’t get enough of and can improve immune, skin and eye health. It also has a comparable amount of protein to peanut butter but contains more magnesium, calcium, potassium and fiber, among other vitamins and minerals. 

If you’ve got a keen eye for botany, you know that almonds are classified not as nuts, but as fruit seeds. But this is true for many of the other foods we call nuts. In fact, the USDA classifies all nuts as fruits because they are "dry, single-seeded fruits that have high oil content."

Aside from the nutrient-packed almond butter, there’s a healthy nut butter option for everyone depending on your dietary goals.

If Vitamin E is what you seek, Crumble Smith recommends peanut butter, almond butter or sunflower seed butter. 

Sunflower seed butter is technically a seed butter but is often used as a nut butter replacement for those who have allergies. If you have a nut allergy, this is going to be the best way for you to get that nut butter experience while getting in a similar level of protein, fiber and healthy fats.

If you want to up your Omega-3 intake, try walnut butter. Walnuts are a great source of Omega-3s, Crumble Smith says, which help increase high-density lipoprotein (or “good cholesterol”) levels. High levels of HDL are associated with a lower risk of heart disease and strokes. Omega-3s are essential polyunsaturated fats, meaning our bodies don’t make them on our own but they’re necessary for a healthy diet. About 68% of adults and over 95% of children consume less than the recommended amount, the National Health and Nutrition Examination Survey found.

If you need more calcium – something vegans may struggle with – almond butter or sesame seed butter are your best options. Okay yes, it’s technically a seed butter, but it can be used similarly to nut butter in sauces and dressings (think tahini) or even as a spreadable, sweet snack alternative. Take a look at these numbers from the U.S. Department of Agriculture: One tablespoon of peanut butter contains about 7.84 milligrams of calcium while a tablespoon of sesame butter contains 19.7 milligrams and almond butter has 44.6 milligrams.

For estrogen-dominant individuals, cashew butter is a good option, Crumble Smith says. Cashews contain anacardic acid, which has an anti-estrogen effect and also may slow pancreatic cancer progression, a study published in BioMed Central found.

How do peanuts grow?:Here's how they go from soil to shelf

What to look for when buying nut butter

While nut butters are nutrient-dense foods, added ingredients in store-bought jars move the food away from what it truly is at its core – just nuts. 

“Hydrogenated oils are often added to make things more creamy, to increase shelf life, but those hydrogenated oils are also very inflammatory, they can increase levels of LDL, the unhealthy form of cholesterol,” Crumble Smith says. 

A little mainstream peanut butter paired with an overall healthy diet isn’t the end of the world, Crumble Smith previously told USA TODAY, but natural nut butter with minimal ingredients is a much healthier choice.

So what makes “natural” nut butter? Crumble Smith says to look for single ingredients – nuts release their own oils when ground, so you really only need peanuts to make peanut butter, almonds to make almond butter and so on. If the ingredients label does list oil, try to look for the oil of the actual nut or seed you’re consuming: peanut oil in peanut butter, for example. 

Some stores offer a grind-in-store option for fresh nut butter, but the easiest way to control the ingredients in your nut butter is to make it at home.

“Pumpkin seed butter or walnut butter, those can be really expensive,” Crumble Smith says. “It’s really easy to make at home, all you need is a food processor or high-powered blender and if it’s difficult to get (nuts) to blend initially, then you can add a little bit of coconut oil or even a little bit of avocado oil.”

Crumble Smith says she’ll also sometimes throw a spoonful of leftover store-bought peanut butter into the blender to get the process going.

Is peanut butter good for you?

Peanuts are technically legumes like peas, edamame and lentils, but we often refer to them in the nut and nut butter category because of their distinct taste and name.

Peanut butter is one of the more inexpensive nut butter options, making it an affordable source of protein, fiber and healthy fats. Look for options with minimal added sugar and ingredients – often just peanuts and a little salt – for the healthiest options, Crumble Smith says.

The other component of peanut butter and your health is food safety. Peanuts grown in warm and humid regions may grow mold during harvesting or in storage and transit and develop aflatoxin, a natural byproduct of mold. Exposure to aflatoxins is associated with increased risk of liver cancer, the National Cancer Institute says. 

There’s never been an outbreak of human illness caused by aflatoxins in the U.S., but there have been in other parts of the world. The Food and Drug Administration has federal regulations in place to monitor aflatoxin content and make sure your peanut butter is toxin-free. Still, you may want to exercise caution with homemade peanut butter. Don’t use peanuts that are moldy, shriveled or discolored to make nut butter.

Which nut butter is best for weight loss?

Nuts and nut butters are nutrient-dense foods, so the calories you absorb from eating any kind of nut butter will support a healthy diet, Crumble Smith says. Added hydrogenated oils, sugar and salt are what could take away from the health of nut butter. 

Nut butter is also easier to overeat than regular nuts, so if you’re choosing one of the more popular brands with added sugar, be mindful of portion size, Crumble Smith says.

“Just the simple act of chewing, that slows down the eating process and allows more time for our brain to register that we’ve actually eaten something, whereas nut butter is really easy to overeat,” she says.

But in general, nut butter is a great addition to any healthy diet. Add it to smoothies, yogurt, granola or even try it in a savory dressing or sauce, Crumble Smith recommends.

Discover more health tips for your daily diet: 

• Healthiest fruit: This one has cognitive and cardiovascular benefits
• Healthiest vegetable: Check out these great nutrient-dense options
• Healthiest nut: Add these two daily for cognitive benefits and more
• Healthiest fast food: Look for this kind of menu next time you're out
• Healthiest bread: One is best, but your options for a healthy diet are aplenty
• Healthiest rice: Settling the white rice vs. brown rice debate
• Healthiest oil: Most have some benefits but these two might be best
• Healthiest beer: Consider these factors before you crack open a cold one
• Healthiest cereal: Inside the nutritional info on the back of the box
• Healthiest salad dressing:Best options, plus recipes to make your own 
• Healthiest breakfast:Follow this 3-step guide in the mornings
• Healthiest butter:Look for this kind at the grocery store  
• Healthiest deli meat:Guide for your next sandwich, plus during pregnancy
• Healthiest sugar substitute:Does one exist? Here’s what to know
• Healthiest ice cream:What to know before grabbing a “healthy” ice cream
• Healthiest snacks:Try these combos next time the hunger hits
• Healthiest meat:Expert tips to serve up a nutrient-rich plate 
• Healthiest energy drink:What to know before you reach for another one
• Healthiest smoothie:Try out these ingredients in the blender
• Healthiest soda:The answer is tricky – here’s what to know
• Healthiest beans:Options for protein, fiber, iron intake
• Healthiest alcohol:Low-calorie, low-sugar options to try
• Healthiest water: How to sift through supermarket options
• Healthiest fats:You should be consuming more of this essential fat
• Healthiest Starbucks:Hacks to know at the order counter
• Healthiest diet:Why the answer encompasses more than just food
• Healthiest lunch:Use this guide for a foolproof healthy meal
• Healthiest chips:The salty details about baked, fried and homemade

Just Curious for more? We've got you covered

USA TODAY is exploring the questions you and others ask every day. From "Where do sesame seeds come from?" to "How to make coffee without a coffee maker" to "Why do dogs lick you?" − we're striving to find answers to the most common questions you ask every day. Head to our Just Curious section to see what else we can answer for you.