Flake Shake: calories and sugar by portion and age

Slim Chickens Flake Shake, milk chocolate flake milkshake in a tall clear glass, nutrition and calories

Boone’s analysis puts Slim Chickens Flake Shake at 34% of an adult’s daily calories, 43% of the daily salt limit for a child aged 4 to 6 and 18.5 teaspoons of free sugar.

How many calories are in a Slim Chickens Flake Shake? It contains 685 kcal, 29.8g of fat (16.4g saturated), 86.8g of sugar and 1.3g of salt.

Build a full meal with our nutrition calculator

Use the Boone meal calculator to build a full meal rather than view this item on its own. Add a main, fries, dips and a drink, then choose your age and sex for a more accurate view of how a Flake Shake fits into a day.

Nutrition information

Nutrition information: Slim Chickens Flake Shake

Energy	685 kcal
Fat	29.8g
of which saturates	16.4g
Carbohydrate	92.2g
of which sugars	86.8g
Fibre	8.4g
Salt	1.3g
Protein	10.7g

Nutrition figures are Slim Chickens UK published data from its online allergen and nutrition menu (September 2026), per item as sold and before any optional sauces or extras. Boone converts them to the portion and age comparisons on this page.

Slim Chickens Flake Shake contains 685 kcal, which is 34% of the 2,000 kcal adult daily reference intake. It provides 29.8g of total fat, of which 16.4g is saturated, 86.8g of sugar, 8.4g of fibre, 1.3g of salt and 10.7g of protein.

The saturated fat content of 16.4g represents 82% of the adult daily guideline of 20g.

Sugar in Slim Chickens Flake Shake

Slim Chickens Flake Shake contains 73.8g of free sugar per standard serving (18.5 teaspoons). The total sugar figure Slim Chickens publishes is 86.8g; the difference is naturally present in milk and does not count towards the limits below. High sugar

The NHS free sugar limit is 30g per day for adults, 24g for children aged 7 to 10, and 19g for children aged 4 to 6. Free sugar excludes the sugars naturally present in milk and whole fruit.

Free sugar by portion: Slim Chickens Flake Shake

Portion	Adult (female) 30g	Adult (male) 30g	Age 11 to 17 30g	Age 7 to 10 24g	Age 4 to 6 19g
Per portion	73.8g 246%	73.8g 246%	73.8g 246%	73.8g 308%	73.8g 388%

Teaspoons: 18.5 tsp

Boone calculates these percentages from Slim Chickens UK published nutrition data against UK Dietary Reference Values and NHS free sugar and salt limits. Free sugar, salt, calories and saturated fat are limits to stay under. For guidance only.

Salt in Slim Chickens Flake Shake

Slim Chickens Flake Shake contains 1.3g of salt per standard serving. Moderate salt

Children have lower salt limits: 3g per day for ages 4 to 6, 5g for ages 7 to 10.

Salt by portion: Slim Chickens Flake Shake

Portion	Adult (female) 6g	Adult (male) 6g	Age 11 to 17 6g	Age 7 to 10 5g	Age 4 to 6 3g
Per portion	1.3g 22%	1.3g 22%	1.3g 22%	1.3g 26%	1.3g 43%

Calories in Slim Chickens Flake Shake

Slim Chickens Flake Shake contains 685 kcal per standard serving. Moderate calorie share

Daily calorie needs vary by age and sex.

Calories by portion: Slim Chickens Flake Shake

Portion	Adult (female) 2000 kcal	Adult (male) 2500 kcal	Age 11 to 17 1936 kcal	Age 7 to 10 1553 kcal	Age 4 to 6 1291 kcal
Per portion	685 kcal 34%	685 kcal 27%	685 kcal 35%	685 kcal 44%	685 kcal 53%

Saturated fat in Slim Chickens Flake Shake

Slim Chickens Flake Shake contains 16.4g of saturated fat per standard serving. High saturated fat

The saturated fat guideline is 20g a day for women and 30g for men, and lower for children.

Saturated fat by portion: Slim Chickens Flake Shake

Portion	Adult (female) 20g	Adult (male) 30g	Age 11 to 17 20g	Age 7 to 10 18g	Age 4 to 6 16g
Per portion	16.4g 82%	16.4g 55%	16.4g 82%	16.4g 91%	16.4g 102%

Free sugar vs total sugar

Where the sugar comes from: Slim Chickens Flake Shake

Roughly 73.8g of the 86.8g counts as free sugar, or about 18.5 teaspoons. The rest is lactose, estimated from the 10.7g of protein. Slim Chickens does not publish the split, so the free figure is Boone’s estimate and is deliberately rounded so it is not understated.

NHS daily free sugar limits: 30g for adults and children 11+, 24g age 7 to 10, 19g age 4 to 6.

Ultra-processed food: what is really in it

Processing: Slim Chickens Flake Shake

Boone cannot classify this item, because Slim Chickens does not publish an ingredient list for it.

NOVA classification is read from an ingredient list. Without one there is no way to count additives, separate raw ingredients from manufactured ones, or say whether an item is ultra-processed. Boone does not estimate a NOVA group, because a guess presented as a classification would be worse than saying nothing.

Classification is based on published ingredient lists only. If Slim Chickens publishes one, this section will be updated.

Ingredients

Slim Chickens does not publish an ingredient list on its allergen and nutrition menu

Ingredients: Slim Chickens Flake Shake

The Slim Chickens UK allergen and nutrition menu gives nutrition figures for a Slim Chickens Flake Shake but no ingredients, and the chain is under no legal obligation to publish them.

Food made to order in a restaurant counts as non-prepacked under UK food law. The legal requirement is to declare the 14 major allergens, and for large businesses in England to show calories at the point of choice. A full ingredient list is voluntary. Some chains publish one anyway.

Without an ingredient list, no page on this site can tell you how many ingredients are in this item, how many of them are manufactured substances, or whether it is ultra-processed. Boone will not estimate any of it.

Allergen information for this item is published by Slim Chickens and is shown below. Recipes change, so always check in restaurant before ordering if you have an allergy.

Allergens at a glance

Slim Chickens Flake Shake contains milk.

Allergen information: Slim Chickens Flake Shake

Allergen	Status
Cereals containing gluten	Not declared
Sesame	Not declared
Soya	Not declared
Milk	Contains
Eggs	Not declared
Fish	Not declared
Crustaceans	Not declared
Celery	Not declared
Mustard	Not declared
Molluscs	Not declared
Lupin	Not declared
Peanuts	Not declared
Tree nuts	Not declared
Sulphites	Not declared

Contains = declared as an ingredient in the Slim Chickens UK allergen menu (September 2026). May contain traces = Slim Chickens says a supplier makes the ingredient where this allergen is handled, with a significant risk of cross-contamination. Not declared = not listed on that menu, which is not the same as allergen free. Slim Chickens has no allergen-free areas, cooks deep-fried items in shared fryers and says it cannot guarantee any item is allergen free. Tell staff about any allergy before ordering.

Frequently asked questions

How many calories are in a Slim Chickens Flake Shake?+

Boone calculates that a Slim Chickens Flake Shake contains 685 kcal, which is 34% of an adult’s 2,000 kcal daily reference intake and 53% of the daily intake for a child aged 4 to 6.

How much sugar is in a Slim Chickens Flake Shake?+

Slim Chickens publishes a total sugar figure of 86.8g for a Slim Chickens Flake Shake, and Boone calculates that around 73.8g of that is free sugar, or about 18.5 teaspoons. The rest is lactose, which NHS daily sugar limits do not count.

How much saturated fat is in a Slim Chickens Flake Shake?+

A Slim Chickens Flake Shake contains 16.4g of saturated fat. Boone calculates this as 82% of the daily guideline for an adult woman and 55% for an adult man, because the guideline differs by sex: 20g and 30g.

How much salt is in a Slim Chickens Flake Shake?+

A Slim Chickens Flake Shake contains 1.3g of salt. Boone calculates that as 43% of the daily limit for a child aged 4 to 6 and 22% of an adult’s 6g limit.

Is a Slim Chickens Flake Shake ultra-processed?+

Slim Chickens does not include ingredient lists in its UK allergen and nutrition menu, and UK law does not require them for food made to order, so Boone cannot assign a NOVA group to this item.