The use of a nutritional composition including arabic gum (AG) improves gut impermeability. The nutritional composition also improves conditions like abdominal pain, chronic or not, insomnia, bloating, flatulence, shortness of breath, gluten intolerance, malnutrition, muscle cramps, multiple chemical sensitivities, muscle pain, myofascial pain, mood swings, poor exercise tolerance, poor immunity, poor memory, recurrent skin rashes, brittle nails, hair loss, food allergies, constipation, diarrhea, liver dysfunction, brain fatigue, abdominal spasms, constant hunger pains, depleted appetite, Irritable Bowel Syndrome, chemotherapy, food allergies, acne, liver dysfunction or inflammation of the bowel.