Should a person's weight affect his or her's chances for promotion?

In my opinion, I feel that a person's weight should not affect his or her's chances of promotion. Firstly, performance is the main factor for promotion and hence, a person who is obese should stand the same chance of getting promotion as people who are not.
Many may argue that appearance is important too and I do agree that if you are obese, it is very hard to get jobs such as front desk personnel in hotels but in most private businesses, not every worker in the company meets clients. Most do their work at their desk the whole day. Hence, appearance would not count and the obese person should stand an equal chance to get promotion as a normal person.
However, supposing the obese person is somehow the only choice for a certain job, one that requires meeting clients, then appearance but I still feel that it should not affect the person's chances for promotion.
A company can also take some steps and measures to cut down on the amount of obese and overweight people in their company. One would be to hold a session compulsory for all employees and explain to them the importance of having a normal weight and not being obese. This way, not only will the obese people have and equal chance of promotion, but they may also take the advice and try to slim down, killing two birds with one stone.