Hunger

Note that Hunger and Energy are different things. Hunger is only related to FEP bar. Energy is different thing.

Hunger Levels

Unlike legacy haven hunger levels are NOT effected by ingame activities other than eating foods. Hunger level only decreases over real time depending on your hunger level.

Each food has a hunger value that adds up when eaten to change your Hunger Level once at 100%. Each subsequent hunger level has a lower "Food efficiency" bonuses, but takes less time to return to a lower hunger level.

Hunger Level	Food Efficiency	Approx time to lose 1% hunger	Variety Bonus	Variety Example @15 max stat
Ravenous	300%	2 hourс	1.097	28.3%
Famished	200%		0.894	23.1%
Hungry	100%		0.632	16.3%
Content	90%		0.602	15.5%
Full	50%		0.447	11.5%
Stuffed	25%	46 seconds	0.315	8.1%
Overstuffed	10%	7 seconds

Food Efficiency

This value is effectively the same as the "food event bonus" also given on some Symbel. It multiplies the FEP value of the food you eat to be either positive or negative by the percentage shown. It also positively effects Variety bonus see below

Variety Bonus

Jorb posted that variety bonus effect by food efficiency here [1]. This bonus works simularly to legacy where each new food type eaten will decrease the amount of FEPs in order to level-up an attribute. It is increased by higher food efficiency, but is also reduced by your highest Base attribute (max stat).

Variety math and example

To work out the variety bonus at Famished's 200% food efficiency, we take the value from the chart and multiply it by the squareroot of our example max stat 15:

$0.894*{\sqrt {15}}=3.46$

This means that our fep requirement is reduced by 3.46, which is 28.3% of our max fep requirement of 15. If our max stat is 40 the reduction is instead 5.6, which is now only 14.1% of our max.