TMI warning but I'm desperate: it's been 5 days and nothing. I'm on week 3 of keto. Is this normal? What can I do? I'm eating plenty of fat but very few vegetables because I'm scared of going over my carb limit. Is that the problem?
Very common and very fixable. Here's what's happening and what to do:
Why it happens: You've removed most of the dietary fiber you were getting from grains and high-carb foods. Also, your gut bacteria population is shifting. And reduced food volume overall means less bulk to move through.
Fixes that work:
1. Eat your vegetables — most low-carb vegetables are mostly fiber anyway. Broccoli, spinach, zucchini, celery won't kick you out of ketosis. Don't skip them.
2. Magnesium citrate or magnesium oxide specifically — these forms of magnesium draw water into the bowel and stimulate movement. 300-400mg before bed. Your electrolyte magnesium (glycinate) doesn't do this — you need the citrate or oxide form specifically for this.
3. Drink more water — dehydration on keto is real and directly causes constipation.
4. Psyllium husk — pure soluble fiber, zero net carbs. Mix 1 tbsp in a big glass of water. Adds bulk, feeds beneficial gut bacteria, improves transit.
The magnesium citrate trick works within 6-12 hours consistently. It's the fastest reliable fix. Just be near a bathroom when you take it — "draws water into the bowel" is a polite way of saying what's about to happen will be urgent.
I add psyllium husk to my daily routine now (not just for constipation but for general gut health on long-term keto). 1 tablespoon in water with a squeeze of lemon in the morning. Zero net carbs, genuinely helps with regularity, and feeds the gut bacteria that high fiber grains used to feed.
Taking magnesium citrate tonight and ordering psyllium husk. Also going to stop avoiding all vegetables — I was eating almost zero trying to stay well under 20g and that was probably the main cause. Thank you!