The general theory is that when someone is successful they almost always assume they somehow earned that success, even when there is evidence that they were privileged. Lately I've been thinking about this same attitude from the perspective of parenting or dating and even exercising.
Someone who is a parent will often give advice to someone who has younger children or who doesn't have children at all. The general theme behind the advice is "I know something about parenting that you don't". In a sense, this individual is taking a position above the one hearing the advice based on his or her experience as a parent. The biggest problem with this assumption is that the parent is assuming that in some way they are better because they earned the privilege of bearing offspring from their womb. The advice they gave may be terrible, but both parties will assume that experience has given them authority on the subject. I'm pretty sure that every individual who ever tried to have children is aware of the actions needed to create a baby, but there are sometimes situations where fertilization doesn't occur and it has nothing to do with 'earning' the right to parent. In fact I personally know a few people that probably shouldn't have reproduced, but they have.
Every person who is single that I personally know has been given advice from married people about how to no longer be single. The intention behind the advice is always good, but the problem is the advice doesn't typically lead the single person to suddenly understand what they are doing that prevents them from finding a deep relationship. If we apply the same concept as the wealthy verses the poor to a single person then in this case the wealthy is the married person and the poor gal is single. The assumption both parties are making is that the single person is somehow 'broken' and didn't earn the privilege that the married person somehow earned. This idea might work if single people were basically annoying individuals, but the thing is they are usually quite amazing people that simply happen to be single.
So, being the kind of person I am; I took this concept even deeper to the subject of exercise. One could even argue it from a more general perspective of 'healthy lifestyle'. Someone who enjoys exercise is probably going to have a difficult time understanding the person who honestly hates to exercise or eat healthy. In line with all the other areas I spoke about above, the healthy person will commonly give advice to the 'less healthy' in an attempt to direct them to changing their habits with the assumption that the 'less healthy' just needs to earn the privileged the healthy person enjoys. While this is a harder case to make since we do get to choose if we exercise or not, there is still the element of how health is defined. If the person who is making healthy decisions fails to honestly listen to the unhealthy person talk about the pitfalls they are encountering, then they are ultimately going to make assumptions that about exercising that won't apply to the unhealthy person. How would that same conversation sound if the joy of exercising was recognized as a gift someone is born with rather than an earned position based on behavior choices? Something even harder to consider is how often have you assumed someone is healthy based on their weight, then found yourself silently shocked to watch them eat an entire package of cookies on a regular basis.
What I'm really talking about here is the way we assume that the natural gifts we have as humans are something we earned. However, if we honestly broke these labels down we might discover that we didn't actually earn anything at all.