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everyday activites become harder – anything from carrying the shopping from the car, holding a baby for a long time, doing the gardening/cleaning, etc.

athletic ability becomes reduced – it gets harder to play sports or anything physically competitive.

Low levels of muscle indeed can make you skinny. But these low levels also have disadvantages:

If this person started eating more than their body need, then they would start gaining weight. If this person didn’t exercise, then that weight would be fat as their body wouldn’t have anywhere else that would need the extra energy. Thus, the “skinny” person becomes “fat-skinny” (a body type with low body mass but relatively high body fat levels). Because of this, people who want to be skinny have the idea that they need to eat minimally, which does work, but only because you lose muscle mass as well. Typically, people who fall under this category find themselves eating whatever they want once or twice a day, which could include sugary, unhealthy foods that would significantly spike their blood sugar levels and force those calories straight into their fat stores.

Now, because muscle weighs around 3 times more than fat, and is a lot more difficult to obtain than fat, it is far more common for muscle levels to be low in order for a person to be “skinny”. These low levels of muscle tissue require less energy to be maintained, which means a person with these low levels would actually burn less energy/calories than somebody with more muscle. This means that this person would only need to eat little every day otherwise they would risk putting on weight.

Being skinny mean that you weigh little, or have low body mass (or little “meat on their bones”), for your height. For example, somebody who is 160cm tall and weighs 45kg would be considered skinny. For this person to have such a low body mass, they must either have very low fat levels, or low levels of muscle tissue (or possibly both).

The “skinny look” is an appearance many strive for in this current time. To many, being skinny looks good. But what exactly does it mean to be skinny?

The Skinny Look (for women) « BCT Blog | Personal Training & Nutrition in Thailand