On this page
That jar of cornstarch in the back of your pantry has probably been there since you moved in. You reach for it without thinking, a spoonful into the sauce, done. Switching to paleo doesn't mean you lose the silky gravies and glossy stir-fry sauces. It just means you grab a different jar.
What You're Replacing and Why
Cornstarch is a refined starch pulled from the endosperm of corn. On its own it's flavorless, which is why it became the go-to thickener. The problem for paleo eaters is that commercially grown corn is almost entirely a genetically modified crop, the USDA reports roughly 92% of U.S. corn acreage is GMO, and conventional corn starch is also a grain-derived, heavily processed powder that strips out everything the whole food had going for it. Grain is grain, processed is processed. That's the short version of why it's on the skip list.
None of that is a lecture, I used cornstarch for years and didn't think twice about it. But once I started paying attention to what I was actually putting in my food, swapping it out was one of the easiest wins on the list.
The Swap: Arrowroot Powder
Arrowroot powder (sometimes labeled arrowroot starch or arrowroot flour, same thing) comes from the root of the tropical Maranta arundinacea plant. It has been used as a thickener for centuries, and it is naturally grain-free, gluten-free, and paleo-friendly.
The ratio is simple: use the same amount of arrowroot as you would cornstarch, or go slightly less, arrowroot is a touch stronger, so some cooks back off to about three-quarters of the amount. Dissolve it in a small amount of cold water or cold liquid first (this is called a slurry), then stir it into your hot sauce or gravy at the end of cooking. It thickens fast and produces a clear, glossy finish that is actually prettier than the slightly cloudy result you get from cornstarch.
Arrowroot also thickens at a lower temperature than cornstarch, which matters for delicate fruit sauces and pie fillings where you don't want to overcook everything.
What Honestly Changes
The good news first: in most applications, stir-fry sauces, pan gravies, soups, fruit compotes, marinades, arrowroot performs just as well as cornstarch and the end result looks and tastes great. You are genuinely not sacrificing anything.
Now the honest part, because a swap column that glosses over the downsides is just an ad.
Dairy sauces. Arrowroot does not play nicely with dairy. It can turn a cream sauce or a cheese-based sauce slimy if you use too much or cook it too long. For those, tapioca starch (also paleo) is a better call, or you can reduce the sauce down naturally instead.
Freeze-thaw. If you are making a big batch of something to freeze, chili, a casserole sauce, a pie filling, skip arrowroot entirely. It does not hold up after freezing and thawing; the sauce will weep and separate. The Spruce Eats and other kitchen references flag this consistently. Tapioca starch handles freezing better.
Cost. Arrowroot costs more than cornstarch. A dollar or two more per bag, usually. It is not a dramatic difference, but I will not pretend it does not exist. Buy it in bulk if you can; Bob's Red Mill and Anthony's both sell larger bags at a better per-ounce price.
High heat. Arrowroot breaks down if you hold it at a hard boil for too long. Add it at the end, give it a minute to thicken, and take it off the heat. Don't keep simmering hard after it sets.
How to Make the Switch Stick
Start with your next stir-fry or a simple pan gravy. Mix one teaspoon of arrowroot with two teaspoons of cold water, whisk it together, then drizzle into your hot sauce while stirring. Watch it go from thin to glossy in about thirty seconds. Once you see how easy that is, you'll never reach for the cornstarch again, at least not without thinking about it.
Keep the jar next to the stove, not buried in the pantry. Out of sight really does mean out of mind with swaps like this. Label it if you need to: "THIS ONE", whatever it takes.
If you cook a lot of things that get frozen, or you make a lot of cream-based dishes, grab both arrowroot and tapioca starch. They are not identical tools but they are both paleo-friendly and between the two of them you can handle almost any recipe that used to call for cornstarch.
This article is for general informational purposes only and is not medical advice. Always consult a qualified healthcare professional before making changes to your diet or health routine.
Key Takeaways
- Arrowroot powder is the simplest 1:1 paleo swap for cornstarch in most sauces, gravies, and fruit fillings.
- It thickens at a lower temperature and gives a clearer, glossier finish than cornstarch.
- Arrowroot breaks down in dairy-based sauces, use tapioca starch there instead.
- It does not survive freezing and thawing; skip it for anything you plan to freeze.
- Always make a slurry (cold liquid first) and add it at the end of cooking over lower heat.
- It costs a bit more than cornstarch, but buying in bulk closes most of that gap.
Frequently Asked Questions
What is the best paleo substitute for cornstarch?
Arrowroot powder is the most widely recommended paleo substitute for cornstarch. It's grain-free, flavorless, and works at roughly a 1:1 ratio in sauces, gravies, and fruit fillings. For dairy-based sauces or recipes you plan to freeze, tapioca starch is a better option since arrowroot can turn slimy in cream sauces and breaks down after freezing.
Can I use arrowroot powder exactly like cornstarch?
In most cases, yes. Use the same amount or slightly less (about three-quarters), always dissolve it in cold liquid first to make a slurry, and add it at the end of cooking over moderate heat. Avoid holding it at a hard boil for an extended time, it will start to break down and thin out.
Does arrowroot taste different from cornstarch?
No. Both are virtually tasteless and odorless when cooked into a dish. If anything, arrowroot produces a slightly clearer, more neutral-looking sauce compared to the faint cloudiness cornstarch can leave.
Is arrowroot powder the same as arrowroot starch or arrowroot flour?
Yes, all three names refer to the same ingredient, a fine white powder ground from the dried root of the Maranta arundinacea plant. Brands label it differently but the product and its behavior in cooking are identical.
Sources
- USDA Economic Research Service: Adoption of Genetically Engineered Crops in the U.S.
- The Spruce Eats: Arrowroot Powder Substitute
This article is for general informational purposes only and is not medical advice. Always consult a qualified healthcare professional before making changes to your diet or health routine.
