It all depends on what you mean by "fair". And possibly what you mean by "life".
Is it fair that I want to eat everything but if I do I get fat? While other people seemingly eat whatever they want and remain a healthy BMI?
Well, if it's all down to our genes then or our innate willpower then, no, it isn't fair. But then, why should it be? There's no tick box on the settings panel of the universe that determines that a certain level of fairness is automatically activated. Is fairness even a thing? It seems very unfair that I can't be bothered to pursue this line of thought.
But that's life.