Thermodynamics

According to First law of thermodynamics energy can be changed from one form to another, but it cannot be created or destroyed. So, changing energy from one form to another would be considered reusing the energy in my opinion. Energy changes from Kinetic to Potential energy or vice versa. When we start the car and release gas the energy which is  being used is called Kinetic energy and when it stops it turns in to Potential energy. But once we release the gas, the energy that's being used can't be recaptured. However, it's probably being used in the air with other molecules. So, yes I do believe that energy can be reused.

Food

I really like drinking Pepsi, it is a big part of my life. I cannot stand a minute without Pepsi, however if we examine the ingredients in the Pepsi we can see that it has many natural and unnatural ingredients. Most of them which can be harmful to the human body. Ingredients like fructose are natural, however phosphoric acid is an unnatural ingredient. And I don't really care about the food that I consume or drink, however knowing that most of the ingredients contained in Pepsi are harmful, I think I should be more concerned about what I drink or eat. Carbonated water is the biggest component of Pepsi that is harmful to humans as well as caffeine.  Besides Pepsi, I enjoy eating grapes, grapes have potassium, iron and magnesium and Iodine as well as many vitamins. Although your body requires a small amount of these elements, these elements are crucial for the survival of humans. Let's take Iodine for example, although it is a trace element , the deficiency for Iodine leads to a disease known a Goiters. Yes, I believe that occasionally I like to eat a healthy diet. I try to balance the diet between proteins, carbohydrates and lipids. I believe eating a well balanced diet can lead to many positive side effects.