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Food allergens can be transferred through saliva. There are reports of allergic people experiencing symptoms after kissing. A study conducted a few years ago by Jennifer Maloney, MD, and colleagues backs this up. It showed that soon after eating peanut butter, salivary levels of peanut protein were high enough in some to cause a reaction. The same study found that some mouth-cleaning methods, like tooth brushing and using mouthwash, didnt completely get rid of the peanut allergen.
Archaeologists in Tuscany, Italy, found the remains of a first century AD teenager who may have had celiac disease. The teen, a female, appeared severely malnourished and showed other signs suggestive of celiac disease: short stature, osteoporosis, dental enamel defects and cribra orbitalia, a bone condition that researchers think may be an indirect sign of anemia. Food scarcity was unlikely since the overall quality of the teens tomb, as well as her jewels, indicate she came from a wealthy family.
The idea that eating gluten can make you fat is practically gospel in the weight-loss world with many of the most popular diets (South Beach, Paleo, Atkins) advocating gluten avoidance. The number of celebrities touting the benefits of going gluten free has only added momentum to this increasingly popular dietary trend.