Chances are that you or someone you know has experienced unpleasant symptoms after a meal or snack. Maybe you experienced some degree of sneezing, wheezing, rashes, brain fog, joint pain, nausea, bloating, diarrhea, or another symptom. This may have led you to believe you have a food allergy — and maybe you do. But it’s also possible that you have a food intolerance, celiac disease, or a food sensitivity. This is important, because some of the reactions can range from just annoying to life-threatening.
Food intolerance refers mostly to the inability to process or digest certain foods. The most common food reaction appears to be lactose intolerance. As we get older, our ability to digest dairy decreases. That’s because, with age, our intestines make less of the enzyme (lactase) that processes lactose, a type of sugar present in milk and dairy products. As a result, we have more lactose sitting in the digestive tract, which can cause stomach bloating, inflammation, and diarrhea. Research has found that only about 35% of people worldwide can digest lactose beyond the age of about seven or eight.
Lactose intolerance is not a serious disease, but it can be quite uncomfortable. Avoiding dairy products is a surefire way to avoid symptoms; some, like milk, tend to produce more severe symptoms than others, like yogurt and cheese. Over-the-counter lactase enzyme supplements can also help.
A more severe problem happens when someone develops a true allergic reaction, an overblown response by the body’s immune system against a seemingly harmless substance — in this case, a food. The classic example is the potentially life-threatening difficulty breathing and low blood pressure following exposure to peanuts or seafood. Food allergies can show up at any time in our lives, even during older adulthood.
If you think you may have a food allergy, consider allergy testing and treatment, especially if your symptoms are severe (significant rashes, feeling of passing out, facial swelling, and problems breathing). Scrupulously reading ingredient labels is wise. And carrying epinephrine shots in case of accidental ingestion or contact with the food in question is essential and can be lifesaving.
Celiac disease affects about 1% of the Western population. In this autoimmune condition, the ingestion of gluten initiates a complex inflammatory reaction that can make people with celiac disease very sick. Celiac disease is not a true allergy; eating gluten once does not cause an immediate life-threatening problem. However, prolonged and continuous ingestion can cause diarrhea, weight loss, and malnutrition.