Although any diet change will throw off bowel movements, keto dieters are especially prone to diarrhea or constipation. If you're thinking of trying the trendy diet for yourself, here's a breakdown of what you can expect.
You may be constipated on keto
"Most people right away will get pretty constipated," says Liz Weinandy, R.D. at The Ohio State University . This is especially true for people who are used to eating plenty of fiber from whole grains and fruits, which are limited on the keto diet. Carbohydrates are typically capped at 30 grams per day, making it hard to enjoy a bowl of oatmeal or an apple.
You could experience diarrhea on keto
Alternatively, some people may have the opposite problem. Barbie Boules , R.D.N., founder of Nyoutrition, previously told Men's Health this occurs when people don't digest all the fat they're consuming. Plus, many keto-friendly foods contain non-nutritive sweeteners or sugar alcohols, which may cause digestive problems in some people. "Sorbitol in particular is notorious for causing GI upset," she says.
Your poop will probably look different
Stool will have less bulk, due to lack of fiber, and be smaller in size, which isn't exactly ideal. For reference, this would be level one on the Bristol Stool Chart .
"Ideal poop is soft but formed," says Weinandy. "Not too lose and not too solid."
Dr. John Whyte, M.D., MPH and Chief Medical Officer at WebMd says your poop also may be lighter in color due to the high fat content.
Your poop could smell different
Anecdotally, Weinandy says some patients say their bowel movements are more, uh, pungent. "I have quite a few patients who complain of it smelling worse," she says. That's because eating a lot of high fat foods makes stool move more slowly through the gastrointestinal track. As a result, stool sits in your system for longer periods of time and can putrefy more easilyparticularly if you're eating lots of protein.
You may see blood from hemorrhoids
Again, this is anecdotal, but some of Weinandy's patients develop hemorrhoids from being severely constipated. Hemorrhoids are swollen veins in the anal canal that become inflamed from straining or sitting on the toilet for extended periods of time, Men's Health previously reported. That's because sitting all that sitting puts strain on the connective tissue that holds the veins in place. People with hemorrhoids may notice some blood when wiping.
So, how do you prevent these awful side effects?
Weinandy recommends drinking plenty of water and taking a fiber supplement like psyllium husk. Many keto dieters rely on magnesium powder or pills to poop, which Whyte advises against.
"Im not a fan of just taking supplements or minerals without talking to a doctor," he says. "Depending on one's underlying medical condition, they can affect the kidneys or the heart when taken in excess."
Or, you could just give up on being ketolike some of Weinandy's patients.
"It [constipation] could be a make or break deal for some," she says.