McDonald's Bacon Mayo Chicken: calories, nutrition, ingredients and allergens

A McDonald's Bacon Mayo Chicken contains 329 kcal. With small fries the total reaches 579 kcal. With medium fries the total reaches 659 kcal. With large fries the total reaches 759 kcal. Adding a medium Coca-Cola to a medium meal brings the total to 839 kcal. The Bacon Mayo Chicken represents 16% of the 2,000 kcal adult daily reference intake — one of the lower-calorie hot sandwiches on the core McDonald's menu.

Per item: 329 kcal, 12g fat (2.5g saturated), 35g carbohydrate (4g sugar), 18g protein, 1.5g salt. The saturated fat at 2.5g is 13% of the adult daily guideline. The sugar at 4g is 13% of the adult daily free sugar limit and 21% for a child aged 4 to 6. The salt at 1.5g is 25% of the adult daily limit and 50% of the daily limit for a child aged 4 to 6.

Yes. The smoked bacon in a McDonald's Bacon Mayo Chicken is cured with nitrite preservatives. The WHO classifies processed meat — including nitrite-cured bacon — as a Group 1 carcinogen based on evidence linking regular consumption to colorectal cancer. Adding bacon to the Mayo Chicken increases the salt from approximately 1.2g to 1.5g and introduces nitrite preservatives. For those seeking to avoid nitrites, the plain Mayo Chicken is the alternative.

The mayonnaise in a McDonald's Bacon Mayo Chicken contains egg yolk in its ingredient list. However McDonald's UK does not declare egg as a named allergen on this item. This is consistent with the pattern seen in the McChicken Sandwich — where mayonnaise contains egg yolk but egg is not a declared allergen. For anyone with a diagnosed egg allergy, always check the current McDonald's UK allergen booklet directly before ordering.

The mustard allergen in the McDonald's Bacon Mayo Chicken comes from the mayonnaise, which contains mustard as an ingredient. This is the same reason the McCrispy and McPlant declare mustard as an allergen — their sauces contain mustard. The standard burger range uses mustard as a condiment but does not always declare it as an allergen. For anyone managing a mustard allergy, the Bacon Mayo Chicken should be avoided.

A McDonald's Bacon Mayo Chicken contains wheat, soya, sesame and mustard as declared allergens. Egg is present in the mayonnaise ingredient list but is not declared as a named allergen. Milk, rye and barley may be present as traces from shared kitchen equipment. It does not contain fish, crustaceans, celery, lupin or molluscs.

The Bacon Mayo Chicken contains 329 kcal versus approximately 284 kcal in the plain Mayo Chicken — approximately 45 more calories from the bacon. Salt rises from approximately 1.2g to 1.5g. The bacon adds sodium nitrite not present in the plain version. Saturated fat rises modestly. The allergen profile is the same — both contain wheat, soya, sesame and mustard. For those avoiding nitrites or managing salt intake, the plain Mayo Chicken is the more moderate choice.

A McDonald's Bacon Mayo Chicken contains 1.5g of salt — 25% of the adult daily limit of 6g and 50% of the daily limit for a child aged 4 to 6. Adding medium fries brings the combined salt to approximately 2.1g — 70% of the daily limit for a child aged 4 to 6. The bacon is the primary incremental salt contributor over the plain Mayo Chicken.

On calories and saturated fat the Bacon Mayo Chicken is one of the more moderate hot sandwiches on the core menu. The salt at 1.5g uses 50% of the daily limit for a child aged 4 to 6 and the bacon contains sodium nitrite. The four declared allergens — wheat, soya, sesame and mustard — mean it is unsuitable for children with any of these allergies. It is not suitable for vegetarians or vegans. For children, the plain Mayo Chicken avoids nitrites at only marginally lower calories.

Yes. A McDonald's Bacon Mayo Chicken falls into NOVA group 4, ultra-processed foods. The mayonnaise contains stabilisers. The bacon contains nitrite preservatives and dextrose. The bun contains emulsifiers. The breaded chicken coating contains starches, raising agents and seasonings. Industrial additives are present across all four components. All additives are approved for use in UK food.