Final answer:
Mayonnaise is acidic and does not provide a good medium for bacterial growth unless contaminated or mixed with other non-acidic foods. Proper temperature control is important, especially at picnics. Some mayonnaises may contain allergens and be processed in facilities handling other food allergens.
Step-by-step explanation:
Mothers can reduce concerns about ingredients in mayonnaise by understanding that mayonnaise is acidic and does not provide a good medium for bacteria to grow unless heavily contaminated or mixed with other non-acidic foods. It is important to maintain proper temperature control when consuming mayonnaise, especially at picnics where bacterial growth may occur in other foods. Additionally, some mayonnaises may contain allergens such as egg and mustard and may be processed in facilities that handle gluten, milk, soya, celery sulphites, and their derivatives.