What Nuts Are Lowest In Fat? | Chestnuts Win The Fat Match

Chestnuts are the nut lowest in fat by a wide margin, with roughly 1 to 2 grams of fat per ounce.

You scan the nut aisle hoping for a snack that fits your fat goals, but the labels blur together. Every handful seems to land somewhere between rich and indulgent, and it’s hard to tell which options actually keep the fat grams low.

The honest answer has a clear winner. Chestnuts sit in a category of their own, but a few other nuts come in lower than the crowd. Here is how the common options compare and what you should know before grabbing a bag.

How The Fat Content Really Stacks Up

Most people assume all nuts are high in fat because nuts like macadamias and pecans hover around 18 to 22 grams per ounce. That assumption is half-right for the majority but wrong for chestnuts.

A 2023 overview in the journal PMC notes that chestnuts are featured specifically for their low-fat content compared to other nuts. They contain about 1 to 2 grams of fat per ounce, a fraction of what you get from almonds, walnuts, or cashews.

Cashews come in on the lower end of the typical range at about 12 grams of fat per ounce, followed closely by peanuts and pistachios. The difference between chestnuts and the next-lowest option is massive — roughly a tenfold gap.

Why The Fat Number Is Not The Whole Picture

You might assume that choosing the lowest-fat nut is always the best move, but that logic misses a bigger point. The type of fat matters just as much as the total grams.

Most of the fat in nuts is unsaturated, which is the kind that supports heart health rather than harming it. Harvard Health’s nuts protein fiber calories guide points out that nuts deliver anywhere from 3 to 7 grams of protein per ounce and 1 to 3 grams of fiber, alongside those fats.

Here is how the common options break down in terms of fat content and what else they bring:

• Chestnuts: About 1 to 2 grams of fat per ounce. Very low protein and fiber compared to other nuts, but rich in antioxidants like polyphenols and lutein.
• Cashews: Roughly 12 grams of fat per ounce with 157 calories. Lower in fiber than almonds or pistachios, which makes them less filling per calorie.
• Peanuts: Moderate fat at about 14 grams per ounce. Technically a legume, but nutritionally similar to tree nuts. High in protein relative to other options.
• Pistachios: Around 13 grams of fat per ounce. You get more nuts per serving because of the shells, which may help with portion control.
• Almonds: About 14 grams of fat per ounce with 164 calories. High in fiber and vitamin E, and research suggests your body absorbs fewer calories than the label shows.

The takeaway is that lower fat does not always mean healthier. Chestnuts are low in fat, but they also lack the protein and fiber that make other nuts satisfying.

Which Nuts Are The Easiest To Overeat On Fat

If your goal is keeping fat grams reasonable, you want to know which nuts are the sneaky high-fat offenders. Macadamia nuts top the list at roughly 21 grams of fat per ounce, followed closely by pecans at about 20 grams.

Walnuts land around 18 grams of fat per ounce. They are also a source of plant-based omega-3s, which the British Heart Foundation notes are beneficial for heart health, but the fat adds up fast in a handful.

Brazil nuts sit high on the fat scale too, with roughly 19 grams per ounce. They are also extremely high in selenium, which means you should limit yourself to just a few per day to avoid exceeding the upper limit.

The numbers in this table are general averages based on USDA data and the PMC review. Individual brands or preparation methods (roasted vs. raw) can shift the totals slightly.

How To Match Nuts To Your Specific Goal

Your reason for asking about low-fat nuts changes which answer is right for you. Here is how to think through the common scenarios.

1. You want the absolute lowest fat possible: Chestnuts are your pick, but expect lower protein and fiber. They work well chopped into salads or roasted as a snack rather than eaten by the handful.
2. You want lower fat but also satiety: Cashews, peanuts, and pistachios offer a middle ground. The Mayo Clinic’s nuts heart health cholesterol overview notes that eating nuts as part of a balanced diet can help lower cholesterol, even though most of the fat is unsaturated.
3. You are counting calories closely: Chestnuts win here too, with roughly 75 calories per ounce compared to 160 to 200 for most other nuts. Just keep in mind you will get less protein per bite.

If you are not specifically restricted by a medical condition that requires very low fat intake, the fat in moderate amounts of most nuts is generally considered beneficial, not harmful. The bigger issue is portion size.

Low Fat Does Not Mean Low Antioxidants

Chestnuts are often dismissed as a lesser nut because they lack the fat and protein density of almonds or walnuts. That reputation is not quite fair.

Despite being the lowest-fat nut, chestnuts contain antioxidants including polyphenols, lutein, and zeaxanthin. Lutein and zeaxanthin are particularly notable for eye health, similar to what you find in leafy greens.

Chestnuts also provide a decent amount of vitamin C, which is unusual among nuts. Most nuts contain almost no vitamin C, so chestnuts offer a different nutritional profile that complements the other options in your diet.

The Bottom Line

Chestnuts are the clear winner if you are looking for the nut lowest in fat, with a fraction of the fat of any other option. Cashews, peanuts, and pistachios are the next-best choices if you want moderate fat with more protein and fiber. Keep an eye on portion size either way — even the lower-fat nuts add up fast when you eat straight from the bag.

If you are managing a specific health condition like high triglycerides or following a very low-fat diet prescribed by your doctor or a registered dietitian, asking about nuts lowest in fat is a good starting point. Your provider can help you fit chestnuts or other nuts into your daily fat target based on your bloodwork and overall eating pattern.