What should you know about lactic acid and lactose intolerance?

Lactose is the natural sugar in milk and many dairy foods. The small intestine normally uses lactase to split it into smaller sugars for absorption. When lactase is insufficient, undigested lactose reaches the large intestine, where bacteria break it down and may create gas and extra fluid.

Lactic acid is a separate chemical made by cells when they release energy, especially during strenuous activity. It is not the milk sugar responsible for lactose intolerance, and avoiding dairy does not treat exercise-related muscle tiredness. Lactose intolerance commonly presents with abdominal pain, bloating, rumbling or diarrhoea after lactose-containing food.

Keep a brief food and symptom diary, noting the food, portion, timing and symptoms. A clinician may suggest a structured lactose reduction followed by careful reintroduction, rather than removing every dairy food indefinitely. Lactose-free products or lactase products may help some people, while yoghurt and hard cheeses can be tolerated differently from milk.

Do not assume every digestive symptom is caused by lactose. Persistent symptoms may need assessment for another digestive condition. Food Intolerance Testing and Nutrition Counselling can help clarify the pattern and protect calcium and vitamin intake while you adjust meals.

Arrange medical advice if symptoms keep returning, interfere with eating, or began after an illness or bowel problem. Seek urgent help for severe or worsening abdominal pain, repeated vomiting, blood in the stool, fainting, or signs of dehydration such as very little urine and marked dizziness. These features need attention regardless of whether dairy was eaten.

Could my pattern fit lactose intolerance, and should I try a supervised elimination and reintroduction? Do I need testing or a review of other causes? Which dairy foods and alternatives can support my nutrition?