Question

why do we need food? (4marks)

Answer 1

Y
Subscribe Chemistry for the Biosciences
Every month OUP editor and author Jonathan Crowe answers your science questions in the monthly SciWhys column. Got a burning question about science that you’d like answered? Just email it to us, and Jonathan will answer what he can. Today: Why do we eat food?
ou may well be thinking that the question posed in the title of this blog has an all-too-obvious answer. We all know that we eat food to keep ourselves alive. But why do we find ourselves slaves to our appetites and rumbling stomachs? What is actually happening inside each of us that couldn’t happen without another slice of toast, or piece of fruit, or that most vaunted of mid-afternoon pick-me-ups, the sneakily-consumed bar of chocolate?
We’re all familiar with the concept of something needing fuel to keep it going. Just as a power station requires gas or coal to power its turbines and generate energy, so we need fuel – in the form of food – to power our continued existence.
The foods we eat provide us with a range of nutrients: vitamins, minerals, water, fat, carbohydrates, fibre, and protein. These nutrients are put to different uses — as building materials to construct the tissues and organs from which our bodies are made; as the components of the molecular machinery that keeps our cells running as they should. All of these uses are unified by a common theme: a requirement for energy to make them happen. And this is where one particular type of nutrient comes into its own. Step forward the carbohydrates.

Answer 2

Food provides us nutrients and energy ..Nutrients are the substances which provide our body harmones energy for their work so that our body works properly .It regulates our height ,body warmness and energy for repairing of body parts..
So food is important for our body to regulate its function..