So after a talk with unlike them, I report about a problem I had with the "overeating" debuff.
It's d5 90min/d and I started asap to eat regularly food that gave wellness, and quickly started to use only the charred sandwich. At d5 I went into a snow biome for about 10min, hunting some zombie, eat some sandwich during the trip (with a 3-in-a-row near a campfire while i was freezing a bit) and was fine. But like, 5 min later, while I was in the way up to my base the debuff started to pop up.
As I was slowed down, I did wait about 10 more min in my house but it didn't fade away like I would expect and worst I needed to eat more anyway.
I didn't try to abuse the wellness-in-the-cold thing, but end getting stuck anyway because of a small trip in the snow biome. I think it might need a bit of tweak. I took a look at the file, sound simple enough; 1 "stuffed" per 0.1 wellness so I am allowed to get about 0.2 wellness every 100s.
That's 0.002 wellness/s before having the debuff.
The player need (unless you take the perk, I'll talk about it later) 2 food every minute.
That's 0.033333 food/s required to stay alive.
My sandwich give me 16 food for 0.6 wellness.
That's a ratio of 1 food => 0.0375 wellness.
In the end I will eat 0.03333food/s, and it will give me 0.00125 wellness/s. as the cap is 0.002, I don't reach it , and it's fine, when I think only with the food.
As the drink is 1 water/30s, if I do the same with tea (lets say golden rod, 25 water/0.2 wellness, plenty everywhere to harvest) I need to add 0.0002667 wellness/s
That's a total of 0.00152 wellness/s. cap is 0.002, so I'm not on it yet but I start to get really close. I could eventually "loose" 0.000483/s.
However when I'm cold I need an additional food every 10s (or every 5s if I wait until hypo 5)
Same math, it add 0.00375 wellness/s, for a total of 0.00527 wellness/s. It's over the cap of 0.2 (+0.00327/s)
TL;DR for every second you are cold you need to spend 6.77s "not cold" to avoid being overfeed, if you use charred sandwich and goldenrodtea. Some other food is even BETTER at giving you wellness, and make this even worst.
You are not allowed to get cold but in a very quick situation because of this. Perk reduce your hunger/thirst but still not enough anyway to not get overfeed.
So, if you stay in an area where you are cold = do not eat food that give wellness (up to a certain point, see the math above).
I understand you try to avoid the player "farm" the wellness by using the cold but right now in normal gameplay people will get overfeed by playing in a normal way if they live in a cold area (unless they stick to super warm clothe/campfire). I don't think that's a very good idea, you solve a problem but add a worst one.
The biggest issue I have with this is that the slow come rather quickly (80pt only), don't give any warning about your satiation allowed, and slow you an INSANE lot as soon as you hit the cap.
If you think it's a good idea to keep this, here some idea to make it less painful as a feature (up to your liking if I convinced you
) :
-Give a "warning" buff that pop before you reach the cap ("I should stop eating useful/good food and instead eat raw fruit")
-increase the cap a slight (90, 100 ?) so you can make a short trip
-Maybe not go straight up to 40% speed, add one step instead of being a death sentence if there is a zombie nearby
-Have the stuffed value being reduced more quickly if you are over 100 (or more if you increase the cap)
-Have the stuffed value decrease more over some special condition (over a bed for example[Edit : both last shouldn't happen if you are actually cold])
Somehow I don't think that's right 
