All foods (virtually all, at least) provide some form of nutrition or another. It depends mostly on the type of food, how it is being cooked or processed, and how much is being consumed.
fats - 9 calories per gram protein 4 calories per gram carbohydrates 4 calories per gram alcohol 7 calories per gram
You need nutrients in your blood to keep you active. You get nutrients from the foods we eat and if you don't eat enough of our nutrients we get tired and sick.
Carbohydrates and proteins provide 4 calories per gram, while fats provide 9 calories per gram. Alcohol provides 7 calories per gram.
1 gram of protein translates to about 4 calories. 1 gram of carbohydrate (sugar or fiber) translates to about 4 calories. 1 gram of fat translates to about 9 calories."High-calorie food" usually refers to something that is high in fat, or high in calories but low in nutrients. Nutrient-dense foods like fruits and vegetables are usually considered low-calorie foods because they do not contain much fat and contain a high nutrient to calorie ratio.
Almost all foods have nutrients, even fattening foods like french fries have carbohydrates that your body needs for energy. But to much of that leads to an unhealthy lifestyle. So maintaining a balanced diet with the nutrients you need is the way to go.
The primary nutrients that yield energy are carbohydrates, proteins, and fats. Carbohydrates provide approximately 4 calories per gram, while proteins also yield about 4 calories per gram. Fats are the most energy-dense, delivering around 9 calories per gram. Alcohol can also provide energy, yielding about 7 calories per gram.
One gram is equal to one gram.
A pure gram of carbohydrates yields approximately 4 calories of energy, while a gram of protein also provides about 4 calories. In contrast, a gram of fat yields significantly more energy, approximately 9 calories. Alcohol, although not a nutrient, contributes about 7 calories per gram.
There is no general answer to this question. Some foods are heavily refined, which removes nutrients from them. Some examples are flours, breads made from refined flour, white sugar, white rice, etc. Other foods may have been grown in soil which does not contain all the nutrients and macro-nutrients, so those foods would be lacking in nutrients. It really depends on how much processing has been done on the food, whether high heat has been used on it, the soil it was grown in, etc.
A gram of gold weighs a gram
As far as calories go, yes. However, as far as nutrients go, maybe not. In a nutshell, you will benefit more in the long run if you get most of your calories from carbohydrates. 45-65% of your daily calories should be coming from carbohydrates. You will want to select foods that have a high amount of nutrients per calorie. They are called "nutrient dense foods." Fat is high calorie (9 Calories per gram of fat), which means it will be harder to get as much nutrients with with a 100 Calorie spot of fatty food than it will be if you eat 100 Calories of carbohydrates.
Healthy foods, such as fruit and vegetables are natural, from our earth and are full of nutrients. Foods such as lolliesm=, chips and other foods are factory-made and artiicial aren't actually meant to be put in our body. Fresh foods are easy to digest, and can easily make their way through your body. By having a variety of healthy and natural foods you can absorb all of the natural nutrients and vitamins and are much better than the artificial vitamins.