I referred to Chia Seeds in another BLOG post as part of my refeeding strategy for ending extended fasts.
Chia Seeds are one of those SuperFoods which should be a part of our diet. They provide a lot of fiber and very few calories. One ounce (about 2 tablespoons) contains 139 calories, 4 grams of protein, 9 grams fat, 12 grams carbohydrates and 11 grams of fiber (so 1 grams of carbs net), plus vitamins and minerals.
For Low Carb folks the 12 grams of carbohydrates are before subtracting fiber so the net carbs are 1-2.
To use them I soak the seeds in water (1/4 cup seeds to 1 cup liquid) until they take on a chewy texture reminiscent of tapioca pudding, about 20 minutes. Soaked chia seeds can be refrigerated for up to 5 days, so you can make a big batch at the start of the week.
I eat them one day before ending a longer (more than 7 day) fast. I also eat them three hours before refeeding. I usually eat them with a dill pickle which acts as a Sodium bomb.
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[Added 2017-11-08] I find that when I eat Chia Seeds they take about two and a half days to make it through my system, particularly on a PSMF. Your system is probably much quicker than mine. But I also find that there is a quite a bit of bulk that they sweep up with them along the way.
What that means practically is that they make me hold onto weight for a day or two. When they finally pass you may have a couple of lbs drop in one visit to the bathroom. Like other fibers they may provide little notice that they want to be evacuated.
Others have noted similar effects (Can Chia Seeds Ease Constipation?).