Chia Seed Jam
Published July 23, 2021 • Updated March 8, 2026
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I make this low-carb chia seed jam all the time because it comes together in 5 minutes and tastes like the real thing. Just berries, chia seeds, and a little sweetener. No pectin, no canning, no added sugar.
I started making this jam when I went keto back in 2012, and it has not left my fridge since. Regular jam was one of the things I missed most (I’m a PB&J person through and through), and store-bought jam packs around 13g of sugar per tablespoon. This one has about 2g net carbs per serving. That’s the kind of swap I can live with permanently.
The whole concept is simple. You cook berries down until they’re soft, stir in chia seeds, and the seeds do all the thickening on their own. No pectin required. Within about 15 minutes of cooling, the chia seeds absorb the berry juice and form that sticky, spreadable texture you actually want on toast. I’ve made this dozens of times and the ratio I landed on (2 tablespoons of chia seeds to 2 cups of fruit) gives a thick, scoopable result every time.
I use a mix of strawberries, blueberries, and blackberries because they’re the lowest-sugar berries I can find. But I’ve also made batches with just raspberries, and one reader (Faith) swapped in extra blueberries and used orange juice instead of lemon. She said it turned out great. That’s what I love about this recipe. It’s flexible.
One thing I learned the hard way: if you use frozen berries, thaw them first and drain off the extra liquid. Otherwise the jam turns out too watery and the chia seeds can’t absorb enough to set properly. Fresh berries give you the most consistent results, but frozen works as long as you drain them.
I keep a jar in the fridge at all times. It goes on toast, stirred into yogurt fruit dip, spooned over dairy free ice cream, blended into a cucumber smoothie, or just eaten straight from the jar (I do that more than I should admit). You can also swirl it into keto strawberry sauce for a double berry situation.
What makes this different from other keto condiments (and I’ve made a lot of them, from sugar free ketchup to bacon jam) is how close it tastes to the original. The berries do most of the work, and the chia seeds handle what pectin and sugar would normally do. I don’t feel like I’m eating a substitute. I feel like I’m eating jam.
For storage, the jam stays good in a sealed jar in the fridge for about 2 weeks. If you want to stock up, freeze it in small containers for up to 3 months. The texture softens slightly after thawing, but a quick stir brings it right back. I usually freeze two or three jars at a time so I always have some on hand.
Why You Don't Need Pectin
Chia seeds absorb up to 12 times their weight in liquid, which is why they work as a natural thickener without any pectin. I stir 2 tablespoons into 2 cups of cooked berries, and within 15 minutes the whole thing sets into a thick, spreadable texture. That ratio took me several batches to nail down. More seeds and it turns gummy. Fewer and it stays too runny. The trick is stirring them in right after you take the berries off the heat, while everything is still warm. The warmth helps the seeds hydrate faster and distribute evenly. Give it a good stir every 5 minutes as it cools and you’ll get an even set.
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Ingredients
1 cup fresh strawberries, hulled and quartered -
1/2 cup fresh blueberries
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1/2 cup fresh blackberries
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2 tablespoons chia seeds
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2 tablespoons monk fruit blend sweetener
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1 teaspoon fresh lemon juice
Step by Step Instructions
Step by Step Instructions
Cook the berries
Add the strawberries, blueberries, and blackberries to a medium-sized saucepan and cook over medium heat. Cover and cook until the berries are soft, about 5 to 7 minutes, stirring occasionally. Remove from the heat.
Add chia seeds and mash
Stir in chia seeds, monk fruit sweetener and fresh lemon juice to the berries. Mash everything together with a potato masher or fork, leaving some larger pieces of berries for texture if desired.
Nutrition disclaimer
The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.
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Get My Macros + Recipes →Frequently Asked Questions
Can I use frozen berries instead of fresh ones?
I use frozen berries all the time when fresh ones are out of season. The key is to thaw them first and drain off the extra liquid. I learned this after my first batch came out way too runny. Once you drain them, the jam sets up just as thick as it does with fresh fruit.
What can I substitute for monk fruit blend sweetener?
I've tested this with erythritol, stevia, allulose, Truvia, and ChocZero syrups. They all work. My go-to is monk fruit because I like the flavor best, but allulose gives the closest texture to real sugar if that matters to you. Start with a small amount and taste as you go, since sweetness varies a lot between brands.
Can I use ground chia seeds instead of whole?
I've tried it both ways. Ground chia seeds absorb faster, so the jam thickens almost immediately instead of needing 15 minutes to set. The trade-off is you lose that seedy texture and the jam comes out smoother, more like store-bought. If you go ground, use about 1.5 tablespoons instead of 2 because they absorb more aggressively. I landed on that ratio after a couple of overly thick batches.
Why won't my chia jam thicken up?
I've dealt with this a few times, and nine times out of ten it's too much liquid. If you used frozen berries without draining them, that's your problem. The other common issue is not waiting long enough. I give mine at least 15 minutes at room temperature, and it continues to thicken in the fridge over the next hour. If it's still runny after that, stir in another tablespoon of chia seeds and give it 10 more minutes. I've rescued plenty of batches this way.
What fruits work best for keto chia jam?
I stick to berries because they're the lowest in sugar. My ranking: raspberries (break down fast, deep color), strawberries (classic flavor, mild sweetness), blackberries (tangy, hold their shape more), blueberries (sweetest of the four, good mixed in). I've also tried peaches, which work but push the carb count up. Avoid high-sugar fruits like mangoes or pineapple. For the best results, keep the total fruit around 2 cups regardless of which berries you pick.
How do I make the jam thicker or thinner?
I've tested different ratios. For a thicker, more spreadable jam, I use 3 tablespoons of chia seeds instead of 2. For something looser (more like a sauce for drizzling), I stick with 1.5 tablespoons. The 2-tablespoon version in this recipe is my sweet spot for toast and pancakes.
Is this jam healthy?
It is, and that's half the reason I make it. Each serving has about 2g net carbs versus 13g of sugar in regular jam. The chia seeds add fiber (about 5g per tablespoon), omega-3 fatty acids, and protein. I've been making this since I started keto in 2012, and it's one of the few sugar free swaps that I actually prefer to the original. No preservatives, no pectin, no added sugar. Just fruit and seeds.
Can I make a no-cook version?
I've done it. Mash raw berries with a fork, stir in the chia seeds and sweetener, and let it sit in the fridge for about 30 minutes. It works, but I prefer cooking the berries first because the heat breaks them down more evenly and brings out a deeper, jammier flavor. The no-cook version tastes fresher and brighter, almost like a berry compote. My compromise when I'm short on time: I cook the berries for just 2-3 minutes to soften them, then add the seeds off heat.
My mom made strawberry jam from scratch every summer and I basically banned myself from thinking about it when I went keto. Made this on a Sunday and the smell of berries cooking down took me right back to her kitchen. It's not the same (she used pectin and way more sugar) but the lemon juice brightens it in a way that's almost better. I've been putting it on everything.
The 'almost better' thing you said about the lemon juice, I keep thinking about that. Traditional jam has enough sugar it masks everything. You're tasting it more clearly here.
My grandma used to make strawberry jam every summer and the whole house smelled like it for days. I haven't eaten regular jam in two years since going keto and I'd honestly stopped missing it, or at least convinced myself I had. Made this on a snow day last week just to have something to do, and when the berries started cooking down in the pan I had to stop and just stand there for a second. That smell. I mashed everything together and watched the chia seeds absorb and thicken it up, and by the time it cooled I had something that tasted like a memory I thought I'd given up. Not identical to hers, but close enough to make me feel her in the kitchen. I've made three jars since then and I put it on everything.
The smell when the berries start cooking down. That part gets me too. And watching the chia seeds do their thing as it cools still surprises me every time, even after making this for years.
I made this jam today and it is so lovely. I modified it according to what I had on hand so I increased the blueberry amount to make up for my not having any blackberries and I used orange juice instead of lemon. I was unsure about how the orange would go, but it seems to be fine and I’m so glad to have found this recipe. Thank you for developing so many simple, yummy keto treats and sharing them with the world!
Orange juice works fine there. And extra blueberries over blackberries probably made it sweeter. I'd do that again.
This is SO GOOD! Thank you for sharing your knowledge! ♥️
So glad you liked it! I keep a jar in my fridge pretty much constantly now.
Can you use just one berry? If so how much?
Yes! 2 cups of any berry
I don't have lemon juice, but want to make this. Would lime juice work? Would anything else work as a substitute for the lemon juice? ?
Yes, lime juice would work just fine. It's just to brighten the flavor. I use lime juice often when I don't have lemon juice. I always seem to go through the lemon juice first. :)
can you use frozen berries
Yes! Frozen berries will work too