Chocolate

Chocolate was a foodstuff made from cocoa (TV: The Mind of Evil) and enjoyed by humans, somtimes as a treat or a snack. It commonly came in two varieties - milk or dark - and could also be combined with other ingredients, such as mint. (PROSE: Sick Building) Chocolate ice cream was considered "traditional" on Earth. (PROSE: Our Flavours)

Chocolate made both River Song and Brooke 1 feel happy. (AUDIO: A Requiem for the Doctor) Sontarans had a "predilection" for chocolate in response to their heightened metabolic processes on Earth, due to the planet's reduced gravity. (TV: The Vanquishers) For humans, chocolate was good for serotonin levels, (TV: Fragments) and helped one cope during their menstrual cycle. (PROSE: Chasing the Dawn) Finally, for Time Lords, chocolate helped to remove dangerous toxins, (COMIC: The Love Invasion) and counteract poisons like aspirin, due to its triglycerides. (AUDIO: The Condemned)

Chocolate and other cocoa products were a common gift, (TV: The Mind of Evil, Kerblam!) particularly in romantic contexts. (TV: The Aztecs, PROSE: Do You Love Anyone Enough?) Despite this association, the giving of chocolate as a show of good will was also appropriate in corporate settings, even to one's subordinates. (TV: Kerblam!) The Doctor carried around chocolate jelly babies, among other flavours, (GAME: City of the Daleks) to hand off to strangers, in an attempt to convey congeniality. (TV: The Ark in Space, The Robots of Death)

Uses of chocolate
The First Doctor unwittingly proposed marriage to the Aztec wise woman, Cameca, when he shared a cup of cocoa with her. (TV: The Aztecs) In a later adventure, the First Doctor offered Vicki some chocolate to assuage her fears that Ian might be in danger. She, however, refused the gift. (TV: "Escape to Danger")

Jo Grant visited George Patrick Barnham in Stangmoor Prison's infirmary after he was subjected to the Keller Machine, and gave him a box of chocolates as a present. (TV: The Mind of Evil)

Cross confiscated a bar of chocolate from Patel. (TV: Frontier in Space)

RSM John Benton ate a chocolate bar while waiting for news of the Zygon spacecraft. (TV: Terror of the Zygons)

The Fourth Doctor gave Romana II the last Rolo in the universe. (PROSE: Do You Love Anyone Enough?)

The Sixth Doctor once survived being poisoned with aspirin by eating chocolate, which contained simple triglycerides that counteracted the aspirin's effect on Time Lord physiology. (AUDIO: The Condemned)

A piece of Cadbury Dairy Milk chocolate, along with some chicken, formed part of the sandwich the Ninth Doctor ate to stabilise his body chemistry and neutralise the toxins of the chemical mix used against him by Charlotte Cobb, who had initially thought the Time Lord was a hostile alien like the Lend-a-Hand girls. (COMIC: The Love Invasion)

The Tenth Doctor enjoyed a chocolate Easter egg, but then passed it to Lady Christina de Souza after becoming concerned that its sugar content might harm his teeth. (TV: Planet of the Dead)

Myfanwy liked dark chocolate. It was one of the only things Myfanwy would eat without Torchwood's special "barbecue sauce". Ianto Jones noted that chocolate was good for one's serotonin levels, though he wasn't sure if Myfanwy had any. (TV: Fragments)

While hiding in the Doctor's TARDIS, Klov Dreb Fotch Passameer Day Slitheen III stole, among other food, chocolate biscuits. (COMIC: Who Ate All The Biscuits?)

Sontaran Frosted Boom Cakes were coated with pink chocolate. (PROSE: Dr. Thirteenth)

The Thirteenth Doctor gave Yasmin Khan a bar of creamy, delicious chocolate during her "time of the month". (PROSE: Chasing the Dawn)

Other references
Jamie McCrimmon and Driver Gwynfor Evans came across a platform vending machine selling bars of Camfield's Fairy Milk Chocolate at St. Paul's tube station. Fancying some chocolate, Evans tried the machine without inserting any money and discovered, to his surprise, there was a bar in the machine's open compartment. (TV: The Web of Fear)

On a planet visited by the Second Doctor and Jamie, King Conrad ordered his Scientist Royal to invent calorie-free chocolate. (PROSE: Twin Piques)

On Colony 34, outside the walls of Third City, chocolate was one of the many items that was very hard to obtain. (AUDIO: LIVE 34)

Evelyn Smythe loved chocolate so much that even on her initial trip in the TARDIS, she insisted upon bringing her own supply of hot cocoa mix. Indeed, she was a master baker of chocolate cake, and the Sixth Doctor had to use the promise of picking up some specialty chocolate in Mexico or Havana just to get her to travel in the TARDIS at all. (AUDIO: The Marian Conspiracy)

The Tenth Doctor and Martha Jones travelled the universe in search of the perfect chocolate milkshake. (COMIC: Agent Provocateur)

Anji Kapoor was a lover of chocolate. Once, when she, Trix, Fitz and the Eighth Doctor were travelling between parallel versions of the Earth, they encountered an Earth where chocolate had never been invented. They quickly moved on from that Earth. (PROSE: Timeless)

Clara Oswald liked chocolate. (TV: Last Christmas)

Kate Stewart promised Josh Carter to bring him chocolate from Switzerland. (AUDIO: Death in Geneva)

Ram Singh called Switzerland a land of triangular chocolate. (AUDIO: Everybody Loves Reagan)

The Thirteenth Doctor considered Judoon chocolates to be of high quality. (PROSE: The Secret in Vault 13)

While the Thirteenth Doctor did some maintenance aboard the TARDIS, two of the showers were producing chocolate instead of water, which she said was fewer than normal. (PROSE: The Paradox Moon)

Behind the scenes

 * A chocolate jelly baby card was one of 50 collectible cards in series 1 of The Adventure Games, being found in City of the Daleks.
 * The Twelfth Doctor's letter in DWA15 12 mentions Juevos VI, a moon made of chocolate. According to the Doctor there wasn't much to do on Juevos VI because eating the chocolate was illegal.
 * The mention of triangular chocolate from Switzerland in AUDIO: Everybody Loves Reagan is a reference to the distinctive shape of bars, which are a famous Swiss export.

Doctor Who chocolates

 * Coincident with season 8, Nestlé issued the Nestlé's Doctor Who milk chocolate. It came in 15 collectable wrappers, each of which had a tiny instalment of a story called Doctor Who Fights Masterplan "Q", starring the Third Doctor, Jo Grant and.
 * Doctor Who-themed Advent calendars have been issued on several occasions; one version was the Bon Bon Buddies 2010 Doctor Who Milk Chocolate Countdown Calendar based upon series 5 Daleks.