You become constipated when your body is in ketosis because fibrous foods such as whole grains, beans and legumes all contain carbohydrates. Fibre is the most important component which makes you feel full for longer and ensures smooth bowel movement. Excess ketones can be harmful health and are passed through the body via urine. Excessive sodium in the body is also passed through urine when your body is in ketosis. Excess urination can cause dehydration in the body. Symptoms of dehydration include dizziness, exhaustion, dry mouth, extreme thirst, dark coloured urine, dry skin, confusion and head aches.