Starbucks Chocolate Swirl Loaf Cake contains 401 kcal per slice — 20% of the adult 2,000 kcal daily reference intake, 26% for a child aged 7 to 10, and 31% for a child aged 4 to 6. It sits at the lower end of the loaf cake range at Starbucks, below the Pistachio White Chocolate Loaf Cake at 443 kcal and the Banana Nut Loaf at 410 kcal. The two-tone marble pattern uses a chocolate batter swirled with a vanilla batter — the chocolate elements add cocoa fat and sugar relative to a plain sponge.

Per slice: 401 kcal, 18g fat (10g saturated), 55g carbohydrate (35g sugar), 5.1g protein, 0.50g salt. The saturated fat at 10g is 50% of the adult daily guideline of 20g. The sugar at 35g is 117% of the adult daily free sugar limit of 30g. The salt at 0.50g is 8% of the adult daily limit of 6g.

Starbucks Chocolate Swirl Loaf Cake contains 35g of sugar per slice — 8.8 teaspoons and 117% of the adult daily free sugar limit of 30g. For a child aged 4 to 6, this represents 184% of their daily free sugar limit. For a child aged 7 to 10, it is 146% of their 24g daily limit. The sugar comes from the caster sugar in both the vanilla and chocolate batter components, the dark chocolate used in the chocolate swirl — which contains its own sugar — and any icing or glaze on the top. 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.

Starbucks Chocolate Swirl Loaf Cake contains 0.50g of salt per slice — 8% of the adult daily limit of 6g and 17% of the daily limit for a child aged 4 to 6. The salt comes from the butter in the batter and from the natural sodium in cocoa powder and dark chocolate. It is not a significant nutritional consideration relative to the sugar and saturated fat content.

Starbucks Chocolate Swirl Loaf Cake contains 10g of saturated fat per slice — 50% of the adult daily guideline of 20g and 63% for a child aged 4 to 6. The saturated fat comes from the butter used in both the vanilla and chocolate batter components, and the cocoa butter in the dark chocolate swirl. At 10g it is moderate in saturated fat compared to the Lemon Tart at 24g and the Triple Chocolate Brownie at 16g, but higher than the Banana Nut Loaf Cake at 5.2g which uses oil rather than butter as its fat base.

Starbucks Chocolate Swirl Loaf Cake contains 5.1g of protein per slice — 10% of the adult daily reference intake of 50g. The protein comes from the eggs and flour in both batter components. The cocoa solids in the dark chocolate contribute a small amount of additional protein. At 5.1g for 401 kcal the protein-to-calorie ratio is low and typical of butter and sugar-led cake recipes.

Yes. NOVA 4, ultra-processed. The dark chocolate in the swirl contains soya lecithin as an emulsifier. The cake batter contains emulsifiers to extend shelf life, modified starch and raising agents. Any glaze or icing on the top contains glucose syrup. These industrial additives across the chocolate, batter and topping components determine the NOVA 4 classification despite the butter, eggs and flour base ingredients being standard baking components.

Starbucks Chocolate Swirl Loaf Cake contains wheat/gluten, milk, egg and soya as declared allergens — four allergens. The wheat comes from the flour in the batter. The milk comes from the butter in both batter components and the milk solids in the dark chocolate. The egg comes from the whole eggs in the batter. The soya comes from the soya lecithin in the dark chocolate. Notably it does not contain tree nuts — making it more accessible on allergen grounds than the Pistachio White Chocolate Loaf Cake or the Banana Nut Loaf Cake. It does not contain peanuts, fish, shellfish, celery, mustard, sesame, lupin or molluscs. Always tell your barista if you have a severe allergy before ordering.

Yes. Starbucks Chocolate Swirl Loaf Cake is suitable for vegetarians. It contains no meat or fish. It is not suitable for vegans as it contains butter, eggs and milk in the chocolate. It is also not suitable for those with wheat, milk, egg or soya allergies. With no tree nut allergen it is the most allergen-accessible of the three loaf cake options at Starbucks.

At 35g of sugar — 184% of the daily free sugar limit for a child aged 4 to 6 — the Chocolate Swirl Loaf Cake is not appropriate for children. The 10g saturated fat uses 63% of their daily guideline. Four allergens are declared. Despite having no tree nuts, the sugar content alone makes it unsuitable as a children's snack or treat. For children, the Classic Porridge, Egg White Bites or Kettle Lightly Salted Crisps are far more appropriate choices at Starbucks.

The Chocolate Swirl Loaf Cake contains 401 kcal — the lowest calorie loaf cake at Starbucks, below the Banana Nut at 410 kcal and the Pistachio White Chocolate at 443 kcal. Sugar at 35g is the highest of the three loaf cakes. Saturated fat at 10g is between the Pistachio at 11g and the Banana Nut at 5.2g. It has four allergens versus five in both the Pistachio and Banana Nut Loaf cakes — no tree nuts makes it the most accessible on allergen grounds. For the lowest calorie loaf cake with no tree nut allergen, the Chocolate Swirl is the best choice. For the lowest sugar and lowest saturated fat, the Banana Nut Loaf is better despite its tree nut allergen.

At 35g of sugar the Chocolate Swirl Loaf Cake already exceeds the adult daily free sugar limit of 30g before any drink is added. A plain Cappuccino or Flat White adds 9-12g from milk, taking the total to 44-47g. A Caramel Macchiato adds 23g bringing the total to 58g. A Grande Caramel Frappuccino at 48g takes the total to 83g. Only an unsweetened Americano, filter coffee or herbal tea at zero sugar is the appropriate pairing to avoid adding further sugar to an already over-limit total.

Yes. At 35g of sugar — 117% of the adult daily free sugar limit — the Chocolate Swirl Loaf Cake exceeds the daily limit in a single slice. It is the highest sugar of the three loaf cakes at Starbucks — above the Pistachio White Chocolate at 34g and the Banana Nut at 32g. The sugar comes from both the vanilla and chocolate batter components plus the dark chocolate swirl, which each contribute sugar independently. Despite appearing as a single cake slice, the swirl structure means two separate sugar-containing batters combine in each serving.

Starbucks Chocolate Swirl Loaf Cake is the lowest calorie loaf cake at Starbucks at 401 kcal and has the simplest allergen profile of the three loaf cakes with no tree nuts — four allergens only. The 35g sugar is the highest of the loaf cakes and exceeds the adult daily free sugar limit. The 10g saturated fat uses 50% of the adult daily guideline. It is suitable for vegetarians but not vegans or those managing wheat, milk, egg or soya allergies. For those choosing between the three loaf cakes, it is the most allergen-accessible option on the Starbucks menu — though all three loaf cakes exceed the adult daily free sugar limit in a single slice.