plot is unrealistic. No children and fat people? the hell?

Indeed.. why they put all those bathrooms in Andromeda if nobody is ever going to use them?
Stupid game...

There is two contenders for a job on the Andromeda initiative: 

One is obese but pretty good at the job 
One is healthy and pretty good at the job.

Which one should I take? 

Obese people are more likely to suffer from health issues down the line, draining resources like medical supplies and food. Also, there may be mental issues linked to the persons weight, poor self control or low willpower may be a problem. Said overweight person may decrease in productivity eventually. All things you really do not want to deal with in an interstellar colonial project with tight resources and high standards.

Unless you have no other choice or the obese person is incredibly good at his/her job logics dictate to choose the healthy fit person every time.  Any other decision would make no sense. 

Political correctness has to be left out of projects of this magnitude and importance.

First off:
Children and their parents would be kept in Cryo till the very end -they are the future why risk them?
I personally believe the only a skeleton crew was awaken in the beginning and the Hyperion was on automatic before that.
Why have more people active than needed to contain or perform a certain objective.
Kind of like having a band of Marines in charge of a colony ship.
Why need any civilians running around -not their job -nor should they be put in danger -again they are the future.

Second:
Cryo has a positive -if you didn't what temperature can do to the body:
www.coolsculpt.com/coolsculpting.html

So 600 years... pfft easy way to lose pounds.

Edit: Tried expound reason.

Nothing worth doing is ever easy.

I'm surprised this topic hasn't been nuked yet.

There is a perfectly good reason for not having them in the game. 1) if ur too fat to fit in ur stasis pod ur not coming to Andromeda. End of. 2) after the response Star Child got in ME3, forget kids!

I just want to point out that the non-obese person in this scenario does not mean that person is healthy. Presumably you'd screen for all kinds of conditions including cancer, heart disease, muscular dystrophy, etc. The thin person is not necessarily likely to consume fewer resources, including medical care purely on the basis of being thin.

And I'm saying this because you don't see people with any of those conditions, so the premise of the thread is invalid by only referring to fat people.

I agree that it's more likely that a thin person consumes fewer resources, but anyone would a genetic precondition to any long-term illness (including obesity) is likely to not even be getting on the ark.

My issue isn't with your statement, but rather with the premise that "fat people" are what's unrealistic. I mean, unpack that even a little bit and you've gone down a rabbit hole.

As far as I recall, a person can also be internally obese or overweight but appear slim or otherwise skinny on the outside. I think one term for it is skinny fat or tofi. 

Original concept art of Ark Axiom

I'm curious about the OP's user name. Is he/she a slayer who happens to be jailbait? Or someone who slays jailbait? Inquiring minds want to know!

Tell me about it, I have a BMI of 33 which puts me in the fatass category, but I am a weightlifter and I can see my abs. There are many very accurate ways to measure body fat which I'm pretty sure would be standard in 21XX. Also I'm pretty sure for a project of this magnitude a very sophisticated health check would be required. Body weight isn't everything. I'd expect health checks like they do in the NASA for their space program.