Yes most teen boys have an iron deficiency (not enough iron).
Yes, teenage boys need more iron due to their increase in muscle mass. In addition, their blood volume expands and they have a rise in hemoglobin during the growth spurt of adolescence.
they need to grow more and have more upper strength.
The best policy is "trust but verify".
Because they're teens.
Often girls feel more pressured and expected to make a bigger effort than boys. Many teenage girls feel they need to watch their body and looks (make-up, weight, clothes, etc.) more than boys do. Additionally girls have to learn to deal with their body's natural cycle. As such there could indeed be a greater tendency towards depression for teenage girls compared to boys of the same age.
Because girls will be getting their period and they need more iron to replace the blood they lose.
Girls need more iron than boys for this simple fact. Girls lose blood, and therefore need to compensate for blood due to the menstrual cycle. during which in a 3 to 7 day event when the lining in the uterus becomes thick with blood, which then breaks away. As you probably know, this is called a period, and it is when a lot of blood is lost. therefore girls need more iron to create the blood that is lost.
There's probably more than one reason, though I know at least one is because during a girl's menstural cycle she tends to loose a lot of iron and most don't do anything to build it back up so it often affects them through the whole of the month.
A teenage boy needs at least 6 ounces of protein a day or more. Teenage boys bodies and hormones are changing and they need quite a lot of protein.
Teens need the right amount of calories and nutrients (Iron and Calcium) which will help with growth and development. On average teenage girls need 1,800-2,100 calories per day and boys need 2,200-2,700 calories per day.
In general, girls don't need more sodium than boys.
The amount of calories a teenage boy needs depends upon his activity level.Sedentary boys age 9 to 13 need about 1,600 to 2,000 calories per day and sedentary teenage boys ages 14 to 18 require about 2,000 to 2,400 calories each day.Moderately active boys age 9 to 13 need about 1,800 to 2,200 calories per day and moderately active teenage boys ages 14 to 18 require about 2,400 to 2,800 calories each day.Active boys ages 9 to 13 require 2,000 to 2,600 calories per day and active teenage boys ages 14 to 18 need about 2,800 to 3,200 calories each day.