Why is having too much fat, or too little fat, a potentially serious health problem?

If you don't eat enough fat then the potential health problems are heart Problems, Vitamin Deficiencies, Excessive Appetite, Mood Problems.

If you eat too much of a certain type of fat, it can lead to other health problems. A diet rich in saturated fat can raise cholesterol levels in the blood. That increases the risk for heart disease. 

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction