It is probably already suggested somewhere ^^

But why not getting a health status for your lions?

Starving
-ou get the starving status when you have less then 60% hunger (<60%)

- Effects
--- Your male lion doesn't gain it's energy so fast (like it currently is)
--- Your females loos their mood faster
--- nursing cubs don't get enough food, resulting in that they also lose hunger %. You get the risk they get sick

- Solution
--- feeding your lion/lioness. when the female is fed, the cubs get enough/more food the next day

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Parasites
Little bigs all over you. bad looking and they itch!!

- effects
--- negative moodlet on your lions impression, even when you are dreamboat. no lioness shall pick a lion filled with bugs!!
--- negative moodlet for your lioness, resulting in lower success change during hunts
--- There is 5% change other lions get parasites if not treated

- solution
--- grooming (interaction option)
--- buy an item for SB in the Monkey Business! (sort of flower maybe?)

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Wounded
Your lion is wounded.

- effects
--- negative moodlet for your lion. He can not explore with that wounded leg. Submale's can not explore.
--- negative moodlet for your lioness. She can not go on hunting
--- negative moodlet for your cubs. They can not play (and so not gaining skills)

- solution
--- wounds heal automaticly within 1 - 5 days
--- buy an item for SB in the Monkey Business for direct healing

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Sickness/illness
feeling sick, no fun

- effects
--- negative moodlet for your lion. it's hard to find stuff during exploring. You lose energy faster and there is a higher change you lose in battles (both Pvp as NPC)
--- negative moodlet for your lioness. lower success rate to catch something during hunting.
--- negative moodlet for your cubs. they are not in the mood to play. There is a small change (1-5%) to get smaller litters or stillborn cubs. breeding success rate also drops
--- there is 5% change other lions become sick when you don't heal them.

- solution
--- sickness goes over within 3 - 7 days
--- buy an item for SB in the Monkey Business for direct healing

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F.A.Q

Do we need to check our lions each day to see if something is wrong?
no, just for starvation as you have the hunger bar on the profile.
Though when your lion/lioness get sick or wounded, you should get a message with
'??? got sick/wounded'

But what if 5 of my lionesses get sick at the time?
small inbox overload ^^;
or when multiple lionesses get the same status (sick or wounded), they can be included in the same message.