We all need the same food groups at all ages. Although proportions vary by age and gender, so referring to The Canadian Food Guide will give you an idea of what you need, whether you're Canadian or not!
5
the food that you need the most of is the Grain food group.
they need them to keep healthy?
There is no one food that is perfect food you need a food from every food groups
All need nutrients including teenagers...
As a teenager i say: need for relationships, generally rebellious, sociable, prone to friendship groups, hypersomnaic
We need the following percentage of food groups. They are...45% vitamins and minerals40% carbohydrates10% meat fish alternatives5% sugars
body needs food for growth, energy and repair
no food
Different age groups have varying protein requirements due to differences in growth, development, and activity levels. Children and teenagers typically need more protein to support growth, whereas older adults may need slightly more protein for muscle maintenance and repair. Meeting these specific protein needs helps ensure optimal health and function for each age group.
No and yes or if you prefer yes and no. No they don't all need it to survive - yes if they wish to thrive or deliver services to target groups. The British heath service doesn't need marketing to survive -it has more than enough demand for its services.But it uses marketing to deliver services to specific groups at risk eg testing for sexually active teenagers, screening for certain types of cancer.
You need to be more specific . . . How do bivalves get their food ? or, How do mollusca get their food ?