Food is any substance[1] consumed to provide nutritional support for an organism. Food is usually of plant, animal or fungal in origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals. The substance is ingested by an organism and assimilated by the organism's cells to provide energy, maintain life, or stimulate growth. Different species of animals have different feeding behaviours that satisfy the needs of their unique metabolisms, often evolved to fill a specific ecological niche within specific geographical contexts.

Omnivorous humans are highly adaptable and have adapted to obtain food in many different ecosystems. Historically, humans secured food through two main methods: hunting and gathering and agriculture. As agricultural technologies increased, humans settled into agriculture lifestyles with diets shaped by the agriculture opportunities in their geography. Geographic and cultural differences has led to creation of numerous cuisines and culinary arts, including a wide array of ingredients, herbs, spices, techniques, and dishes. As cultures have mixed through forces like international trade and globalization, ingredients have become more widely available beyond their geographic and cultural origins, creating a cosmopolitan exchange of different food traditions and practices. 

Today, the majority of the food energy required by the ever-increasing population of the world is supplied by the industrial food industry, which produces food with intensive agriculture and distributes it through complex food processing and food distribution systems. This system of conventional agriculture relies heavily on fossil fuels, which means that the food and agricultural system is one of the major contributors to climate change, accountable for as much as 37% of total greenhouse gas emissions.[2] Addressing the carbon intensity of the food system and food waste are important mitigation measures in the global response to climate change. The food system has significant impacts on a wide range of other social and political issues including: sustainability, biological diversity, economics, population growth, water supply, and access to food. The right to food is a human right derived from the International Covenant on Economic, Social and Cultural Rights (ICESCR), recognizing the "right to an adequate standard of living, including adequate food", as well as the "fundamental right to be free from hunger". Food safety and food security are monitored by international agencies like the International Association for Food Protection, World Resources Institute, World Food Programme, Food and Agriculture Organization, and International Food Information Council, and are often subject to national regulation by institutions, like the Food and Drug Administration in the United States.

Ingredients needed

1 cup whole milk

3/4 cup sugar

1 vanilla bean, split lengthwise

2 cups heavy cream

5 large egg yolks

1 teaspoon pure vanilla extract

A pinch of salt

In a medium saucepan, heat up the milk, sugar and salt. On a chopping board, use a paring knife to scrape the seeds from the vanilla bean carefully. Add these seeds to the milk, with the scraped bean pod. Take the saucepan off the heat, cover with a lid, and allow infusing for at least an hour.

Chill the cream. Next, you will need to chill the heavy cream in an ice bath. You can make an ice bath by filling a large bowl halfway with icy water. Place a smaller bowl into the water, into which you will strain the cream. Let the heavy cream sit in the ice bowl until cooled.

Make the custard. In a large, clean bowl, whisk the egg yolks until combined. Take the vanilla-infused milk mixture and warm it up again. Once it is warm, gradually stir it into the bowl with the egg yolks, adding a little at a time and whisking constantly to combine. Once all the milk has been combined with the yolks, pour this mixture back into the saucepan.

Combine the custard with the heavy cream. Pour the custard mixture through the strainer, into the heavy cream in the ice bath. Remove the strainer and stir to combine. When the mixture has cooled fully, add in the vanilla extract, cover the bowl, and place in the refrigerator. Leave for several hours or overnight, if possible.

Remove the ice cream custard from the refrigerator. Remove the vanilla bean and spoon the mixture into your ice cream maker. From this point, you can follow the manufacturer's instructions to find out how to freeze the ice cream mixture in your particular machine.

Serve or store. Serve your homemade vanilla ice cream straight from the ice cream maker or store in an airtight container in the freezer to create a firmer ice cream.Vanilla ice cream is the perfect accompaniment to homemade fruit pies and warm chocolate cakes.

It also makes a delicious dessert served on its own, covered in chocolate or caramel sauce and toasted pecans or almonds.

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