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Food, both in edible and drinkable forms, plays several roles in the Half-Life and Portal universe. They can either play an aesthetic role, giving more depth to the universe, or be of use to the player. They sometimes have a specific brand.
 Half-Life story arc
Fast food outlet along the Sector B Line.
- The two different soda vending machines will deliver one can each time a button is pressed; each can gives one health point, serving as a makeshift Medkit when none is available.
- The snack vending machines are used only by the security guard and scientist NPCs.
- As seen in the textures of the unique model using six different skins, the soda brands are, in texture order: "Hai!", "Glub", "Grape Ape", "Guthrie" (a nod to John Guthrie, who designed most of the Black Mesa maps), "Yuck", and "Dante" (a nod to Dante's hell in The Divine Comedy)". The cans were remade for the Dreamcast version of Half-Life, with a higher polycount and higher-res textures. They include "Captivation" (actually the logo of Captivation Digital, the company that made the Dreamcast port), a green can with no brand, "Grape Ape" again, an octopus of Cthulhu's head (with no brand), an insect or a frog coming out of a hole (with no brand), and "Dante" again.
- During Half-Life’s development, actual brands were used on the soda vending machines, including Coca-Cola, Minute Maid, and Fruitopia. As these brands are copyrighted, they were temporary and never to be used in the final game.
- A fast food outlet is located along the Sector B Line. It sells tacos, pizzas and other meals.
- The Anomalous Materials facility features a small cafeteria with a microwave oven in which the player can ruin the meal, revealed later to have been a casserole belonging to Arne Magnusson.
- Sector D features a cafeteria in the Administration Offices. Early in the game's development, the humorous idea of a food fight was proposed to occur in the there, idea eventually rejected. The cafeteria has a large walk-in freezer which stores a number of hanging slabs of beef.
- Coffee is commonly drunk by Black Mesa employees. Coffee machines are seen several times in food courts, and scientist sometimes ask if someone has seen their coffee cup.
- Beer is also drunk by personnel, as security guards sometimes promise a beer to Freeman if they meet again, retconned as said by Barney Calhoun only.
- Some security guards are fond of donuts, which is sometimes mocked by scientists. In the shooting range of the Area 3 Medium Security Facilities, a security guard is humorously seen holding a donut with his right hand, while trying to get his gun with the left hand, instead of simply putting the donut in the left hand, and grabbing his gun with the right hand.
- While Xen's Healing Pools restore the player's health by simply standing in it, Bullsquids are seen drinking in them.
- Xen creatures such as the Bullsquid and the Barnacle, are seen feeding on humans.
- When a Pit Drone dies near another and there are no enemy nearby, the creature will show to resort to cannibalism, and briefly eat at the other creature's corpse.
The cut Coca-Cola vending machine.
The cut Minute Maid vending machine.
The cut Fruitopia vending machine.
In-game screenshot of the Coca-Cola and Fruitopia vending machines in an early Half-Life build.
The "Enjoy" soda vending machine introduced in Half-Life, textured by Yatsze Mark.
The "Soda Pop" soda vending machine introduced in Half-Life.
The 6 different soda cans.
Dreamcast models of the 6 soda cans.
Snack vending machine introduced in Half-Life.
The "Carousel Snacks" snack vending machine introduced in Opposing Force.
"Big Tony's Pizza" logo, as seen in the fast food outlet.
"Tesla's Taco" logo, as seen in the fast food outlet.
 Half-Life 2 story arc
Vortigaunts cooking in Black Mesa East's kitchen.
- "Sometimes, I dream about cheese."
- Food plays a pivotal role in the control of humanity by the Combine:
- Water affects the memory of Citizens, as said by a Citizen in the City 17 Trainstation at the start of Half-Life 2: "Don't drink the water. They put something in it to make you forget. I don't even remember how I got here,".
- Vending machines of "Dr. Breen's Private Reserve" (">B") can be seen around City 17. Similar to the Black Mesa vending machines, they also deliver cans, but they don't give health points to the player. Cans come in blue, red and yellow colors.
- Several fruits and vegetables are seen throughout the games. Watermelons are seen prominently, and can be torn apart by the Gravity Gun; they also seem to be the diet of Lamarr as seen on Kleiner's Lab corkboard. The Black Mesa East kitchen also features carrots, red onions, herbs, a bag of beans, some sort of stew / soup. Pumpkins can be found on the Outskirts, and function the same as watermelons.
- The picture of a Metrocop can be seen on a fast food bag.
- The cut Brickbat weapon was to throw several kinds of beer bottles. The cut Molotov Cocktail is also made of beverage bottles.
- During the City 17 uprising, starving Rebels fantasize about food, saying things such as "I could eat a horse, hooves and all." or "Sometimes, I dream about cheese".
- Empty kitchens are found in several houses in City 17 or along the Coast. Nova Prospekt's kitchen and cafeteria are also seen, in block C1.
Early brush vending machine from the Half-Life 2 leak.
Early Pepsi vending machine from the Half-Life 2 leak.
Metrocop on a fast food bag. The circle is also found on an hamburger box.
A blue ">B" can near Kleiner in his lab.
New Little Odessa's kitchen.
Fire and Antlions in the Nova Prospekt kitchen.
 Portal story arc
The cake, a radio and the Aperture Science Red Phone on the desk of the lobby of GLaDOS' chamber after the end of Portal
- "Cake and grief counseling will be available at the conclusion of the test."
- The cake is featured prominently in Portal, as it is promised by GLaDOS to Chell for when she concludes the tests. The quote "The cake is a lie." by Doug Rattmann has become very famous in the popular culture since then. A cake recipe is also frequently seen on monitors.
- The Ratman dens feature several food and drink containers of water, milk and beans.
- In Portal 2, GLaDOS is attached by Wheatley to a potato battery, capable of powering only her consciousness and most basic functions. The potato-based energy is introduced earlier, in the "Bring your Daughter to Work Day" experiments found in the Employee Daycare Center.
- In the second Enrichment Sphere of Test Shaft 09, it is heard in the announcements that before the test Test Subjects were given coffee containing fluorescent calcium so that the staff can track the neuronal activity in their brains.
Bean can found in Ratman dens.
Water bottle found in Ratman dens.
Milk carton found in Ratman dens.
 See also