I am a bit detail oriented when it comes to the different progress bars... & I was wondering ..

I have a family of 5 and everyone seems to be doing ok but Balolo My 10 year old boy his heath meter is only about halfway .... He is not showing any signs of being sick I have already been feeding them all organics as far as food.... And I even gave Balolo fruit more then once tonight to try and help but his health just won't move I am worried about him why is his so low and everyone elses almost maxed out? Is it a sign ?

Any ideas?