Difference between revisions of "Saturation"
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# '''Maximum nutrition''', or how much nutrition a pawn can store at any one time. Adult [[human]]s can hold 1.0 nutrition. For them, 1.0 nutrition is 100% saturation. This property is almost entirely controlled by [[body size]], via function <code> 1.0 * body_size</code>.<br>Human teenagers (ages 13 - 17) are a special exception; they are smaller than adults, but have a special multiplier to max nutrition so that they are equal to adults. | # '''Maximum nutrition''', or how much nutrition a pawn can store at any one time. Adult [[human]]s can hold 1.0 nutrition. For them, 1.0 nutrition is 100% saturation. This property is almost entirely controlled by [[body size]], via function <code> 1.0 * body_size</code>.<br>Human teenagers (ages 13 - 17) are a special exception; they are smaller than adults, but have a special multiplier to max nutrition so that they are equal to adults. | ||
| − | # '''Hunger Rate''', or how much nutrition a pawn loses per day. Adult baseline humans hunger at a rate of 1.6 nutrition per day. This is determined by species and | + | # '''Hunger Rate''', or how much nutrition a pawn loses per day. Adult baseline humans hunger at a rate of 1.6 nutrition per day. This is determined by species and the [[Hunger Rate Factor]] explaines below. |
In general, humans hunger more than similar animals. An [[alpaca]] has the same [[body size]] as a human, but only hungers at a rate of 0.44 nutrition per day. A [[megasloth]] is four times larger than a human, but hungers at the same rate. Generally, predators hunger slowly - a [[cougar]] eats less than half as much as a [[husky]], for instance. | In general, humans hunger more than similar animals. An [[alpaca]] has the same [[body size]] as a human, but only hungers at a rate of 0.44 nutrition per day. A [[megasloth]] is four times larger than a human, but hungers at the same rate. Generally, predators hunger slowly - a [[cougar]] eats less than half as much as a [[husky]], for instance. | ||
| − | + | ||
| − | ===Levels of | + | === Levels of saturation === |
Characters' saturation level is grouped into four thresholds: Fed, Hungry, Ravenously Hungry, and Malnourished. Each threshold exhibits different effects on a character, especially their [[Thoughts]]. | Characters' saturation level is grouped into four thresholds: Fed, Hungry, Ravenously Hungry, and Malnourished. Each threshold exhibits different effects on a character, especially their [[Thoughts]]. | ||
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For as long as the malnutrition ailment is active, pawns will gain increased hunger. This does not increase the rate of malnutrition severity, just the amount of food after a pawn has been fed. | For as long as the malnutrition ailment is active, pawns will gain increased hunger. This does not increase the rate of malnutrition severity, just the amount of food after a pawn has been fed. | ||
| − | ==Saturation | + | == Saturation changes == |
Saturation goes down every tick (1/2500 of a game hour), depending on the character's current saturation and modifiers on their hunger rate. | Saturation goes down every tick (1/2500 of a game hour), depending on the character's current saturation and modifiers on their hunger rate. | ||
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| − | |||
! Saturation | ! Saturation | ||
! Threshold range | ! Threshold range | ||
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Saturation is increased by [[eating]] [[food]]. For reference, 1 unit of [[raw food]] ([[rice]], [[meat]], etc.) gives 0.05 nutrition, or 5% of a human's saturation meter. A [[simple meal]], [[fine meal]], or [[nutrient paste meal]] gives 0.9 nutrition, or 90% of a human's meter. | Saturation is increased by [[eating]] [[food]]. For reference, 1 unit of [[raw food]] ([[rice]], [[meat]], etc.) gives 0.05 nutrition, or 5% of a human's saturation meter. A [[simple meal]], [[fine meal]], or [[nutrient paste meal]] gives 0.9 nutrition, or 90% of a human's meter. | ||
| − | ==Hunger Rate | + | == Hunger Rate Factor == |
{{stub|section=1|reason=Rough, possibly incomplete list. Also needs verification}} | {{stub|section=1|reason=Rough, possibly incomplete list. Also needs verification}} | ||
| − | The following | + | The following things will modify hunger rate: |
| − | === | + | === Offsets === |
| − | All hunger rate '' | + | All hunger rate factor ''offset'' modifiers stack additively. Once added up, they stack multiplicatively with other modifiers to hunger. |
| − | * [[Gut worms]] | + | * [[Gut worms]]: {{++|100%}} hunger rate factor |
| − | * [[Smokeleaf|Stoned on smokeleaf]] | + | * [[Smokeleaf|Stoned on smokeleaf]]: {{++|30%}} hunger rate factor |
| − | * [[Go-juice#Withdrawal|Go-juice withdrawal]] | + | * [[Go-juice#Withdrawal|Go-juice withdrawal]]: {{++|50%}} hunger rate factor |
| − | * [[Malnutrition]] | + | * [[Malnutrition]]: |
| − | ** Trivial: {{++|50%}} hunger rate | + | ** Trivial: {{++|50%}} hunger rate factor |
| − | ** Minor: {{++|60%}} hunger rate | + | ** Minor: {{++|60%}} hunger rate factor |
| − | ** Moderate: {{++|60%}} hunger rate | + | ** Moderate: {{++|60%}} hunger rate factor |
| − | ** Severe: {{++|60%}} hunger rate | + | ** Severe: {{++|60%}} hunger rate factor |
| − | * Hunger pangs [[persona trait]]{{RoyaltyIcon}} | + | * Hunger pangs [[persona trait]]{{RoyaltyIcon}}: {{++|50%}} hunger rate factor |
| − | * [[Neural supercharger]] {{IdeologyIcon}} | + | * [[Neural supercharger]]{{IdeologyIcon}}: {{++|20%}} hunger rate factor |
| − | * [[Growth vat#Summary|Bio-starvation]] (outside of [[growth vat|vat]]){{BiotechIcon}} | + | * [[Growth vat#Summary|Bio-starvation]] (outside of [[growth vat|vat]]){{BiotechIcon}}: {{++|50%}} hunger rate factor |
| − | === | + | === Multipliers === |
| − | All of these modifiers stack multiplicatively with each other and with the hunger rate factor listed above. | + | All of these modifiers stack multiplicatively with each other and with the hunger rate factor offsets listed above. |
| − | * [[Gourmand]] trait | + | * [[Gourmand]] trait: {{Bad|x150%}} hunger rate factor |
* Stomach implants: | * Stomach implants: | ||
| − | ** [[Reprocessor stomach]]{{RoyaltyIcon}} | + | ** [[Reprocessor stomach]]{{RoyaltyIcon}}: {{Good|x75%}} hunger rate factor |
| − | ** [[Nuclear stomach]]{{RoyaltyIcon}} | + | ** [[Nuclear stomach]]{{RoyaltyIcon}}: {{Good|x25%}} hunger rate factor |
| − | * [[Genetic]] [[metabolic efficiency]] {{BiotechIcon}} | + | * [[Genetic]] [[metabolic efficiency]] {{BiotechIcon}}: Positive metabolic efficiency reduces hunger by {{---|10%}} per point. Negative metabolic efficiency increases hunger by {{++|25%}} per point. Positive and negative metabolic efficiencies are added/subtracted from each other. Metabolic efficiency is effectively capped at -5 ({{Bad|x225%}}) and +5 ({{Good|x50%}}). The final metabolic efficiency is used to determine hunger rate, and will stack multiplicatively with other hunger rate modifiers. |
Despite its name and description, the [[Metabolism]] stat has no impact on hunger rate. | Despite its name and description, the [[Metabolism]] stat has no impact on hunger rate. | ||
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This makes [[kibble]] and [[pemmican]] particularly useful as feed for smaller sized animals. These foods provide more nutrition than raw food, but won't be overeaten like a regular meal would. | This makes [[kibble]] and [[pemmican]] particularly useful as feed for smaller sized animals. These foods provide more nutrition than raw food, but won't be overeaten like a regular meal would. | ||
| − | ==Analysis== | + | == Analysis == |
An adult baseline human will eat roughly 2 [[simple meal]]s, 32 units of [[pemmican]], or 32 units of [[raw food]] per day. | An adult baseline human will eat roughly 2 [[simple meal]]s, 32 units of [[pemmican]], or 32 units of [[raw food]] per day. | ||
Cooking food effectively "creates" nutrition. A [[simple meal]] is worth 0.9 nutrition, but only costs 0.5 nutrition of food to make. This gives simple meals a 180% ''nutrition efficiency'', before the overeating described above. | Cooking food effectively "creates" nutrition. A [[simple meal]] is worth 0.9 nutrition, but only costs 0.5 nutrition of food to make. This gives simple meals a 180% ''nutrition efficiency'', before the overeating described above. | ||
| − | Due to the low food consumption of animals, as well as the efficiency of meals, it is possible to violate the laws of thermodynamics. For example, a female [[cow]] produces {{ | + | Due to the low food consumption of animals, as well as the efficiency of meals, it is possible to violate the laws of thermodynamics. For example, a female [[cow]] produces {{Icon Small|milk}} {{Q|Cow|Daily Milk Average}} per day, or {{#vardefineecho:milk_nutr_per_day|{{#expr:{{Q|Cow|Daily Milk Average}}*0.05}}}} [[nutrition]] in milk per day. A cow consumes {{Q|Cow|Real Hunger Rate}} nutrition per day. While cows cannot consume milk, almost all animals can consume meals, no matter what the meal is made out of. So when a cow's milk is turned into [[nutrient paste meal]]s or even [[simple meal]]s, it can feed itself with plenty of food to spare. This gets even sillier with [[chicken]]s, which produce more nutrition in [[egg]]s than it consumes per day, even before the eggs are cooked. (Note that chickens cannot eat their own eggs, and that they are very prone to overeating.) |
| − | ===Conserving food via malnutrition=== | + | === Conserving food via malnutrition === |
In extreme situations, it may be advisable to stay in a hungry state to benefit from the reduced hunger. Note that this requires significant micromanagement to pull off. Forbid the food and unforbid it when pawns are about to fall unconscious. | In extreme situations, it may be advisable to stay in a hungry state to benefit from the reduced hunger. Note that this requires significant micromanagement to pull off. Forbid the food and unforbid it when pawns are about to fall unconscious. | ||
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If the food is eaten immediately, such human survives: | If the food is eaten immediately, such human survives: | ||
{| class="wikitable" | {| class="wikitable" | ||
| − | |||
! Hours survived !! State | ! Hours survived !! State | ||
|- | |- | ||
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If we instead let the human remain malnourished for 13.75 hours, before eating, the pawn survives: | If we instead let the human remain malnourished for 13.75 hours, before eating, the pawn survives: | ||
{| class="wikitable" | {| class="wikitable" | ||
| − | |||
! Hours survived !! State | ! Hours survived !! State | ||
|- | |- | ||
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Giving a total of 77.5 hours alive. | Giving a total of 77.5 hours alive. | ||
| − | {{ | + | {{Nav|status levels|wide}} |
[[Category:Status Level]] | [[Category:Status Level]] | ||
Revision as of 09:42, 5 April 2023
Saturation is the game mechanic that controls Characters' needs for Food, and is directly tied to Eating, the game mechanic which fills that need. A character with a higher saturation value has eaten recently, and is more full than another character with a low saturation level. You can view saturation of all humans and tamed animals by viewing the "Food" bar and the corresponding mouseover text in the Needs tab.
General mechanics
Saturation is measured in units of nutrition. There are 2 distinct measures of saturation.
- Maximum nutrition, or how much nutrition a pawn can store at any one time. Adult humans can hold 1.0 nutrition. For them, 1.0 nutrition is 100% saturation. This property is almost entirely controlled by body size, via function
1.0 * body_size.
Human teenagers (ages 13 - 17) are a special exception; they are smaller than adults, but have a special multiplier to max nutrition so that they are equal to adults. - Hunger Rate, or how much nutrition a pawn loses per day. Adult baseline humans hunger at a rate of 1.6 nutrition per day. This is determined by species and the Hunger Rate Factor explaines below.
In general, humans hunger more than similar animals. An alpaca has the same body size as a human, but only hungers at a rate of 0.44 nutrition per day. A megasloth is four times larger than a human, but hungers at the same rate. Generally, predators hunger slowly - a cougar eats less than half as much as a husky, for instance.
Levels of saturation
Characters' saturation level is grouped into four thresholds: Fed, Hungry, Ravenously Hungry, and Malnourished. Each threshold exhibits different effects on a character, especially their Thoughts.
The saturation level boundaries are indicated by small notches on the "Food" bar in the tab of eating pawns.
| Label | Saturation | Mood modifier (Humans) |
Production Rate (Animals) |
|---|---|---|---|
| Fed | Greater than 25% | (none) | ×100% |
| Hungry | 12.5% to 25% | -6 | ×50% |
| Ravenously Hungry | >0% to 12.5% | -12 | ×25% |
| Malnourished | 0% | -20 | ×0% |
Speed of animals' production (wool, milk, eggs or chemfuel) is also dependent on the saturation level, as seen above. Note that production is completely stopped only when 0% saturation; the "malnutrition" ailment does not have a direct impact on animal products.
Malnutrition
Once a pawn reaches 0% saturation, they will start becoming malnourished.
When malnourished, pawns gain severity in "malnutrition". Malnutrition is an ailment, with an entirely separate progression to hunger or saturation. When malnourished, malnutrition severity rises by 2% every hour, and once it reaches 100%, the pawn will die. When a pawn is fed, their malnutrition does not immediately go away, though a pawn will no longer gain malnutrition (as Saturation is no longer at 0%).
For as long as the malnutrition ailment is active, pawns will gain increased hunger. This does not increase the rate of malnutrition severity, just the amount of food after a pawn has been fed.
Saturation changes
Saturation goes down every tick (1/2500 of a game hour), depending on the character's current saturation and modifiers on their hunger rate.
The following table describes saturation changes of an adult baseline human (100% hunger rate, 1.6 nutrition/day, 1.0 max nutrition):
| Saturation | Threshold range | Change per hour | Change per day | Game time in state[1] | Game time since 100% food[2] |
|---|---|---|---|---|---|
| Fed | 100% - 25% | -6.67% | -160% | 11.25 hours | 0 hours |
| Hungry | 25% - 12.5% | -3.33% | -80% | 3.75 hours | 11.25 hours |
| Ravenously Hungry | 25% - >0% | -1.67% | -40% | 7.5 hours | 15 hours |
| Malnourished | 0% | N/A [3] | N/A | 50 hours | 22.5 hours |
- ↑ Game time spent in the state from the upper threshold before crossing the lower threshold, assuming nothing is eaten
- ↑ Game time spent before entering the state, assuming nothing is eaten and the starting saturation is 100%
- ↑ Malnourished does not impact saturation directly. Rather, it increases the "Malnutrition" ailment by 2% per hour, and when this reaches 100%, a pawn dies. This ailment will increase hunger rate of a pawn, but only when they have access to food again.
From 100% saturation, a human can survive up to 72.5 hours before dying from malnutrition.
Saturation is increased by eating food. For reference, 1 unit of raw food (rice, meat, etc.) gives 0.05 nutrition, or 5% of a human's saturation meter. A simple meal, fine meal, or nutrient paste meal gives 0.9 nutrition, or 90% of a human's meter.
Hunger Rate Factor
 | This section is a stub. You can help RimWorld Wiki by expanding it. Reason: Rough, possibly incomplete list. Also needs verification. |
The following things will modify hunger rate:
Offsets
All hunger rate factor offset modifiers stack additively. Once added up, they stack multiplicatively with other modifiers to hunger.
- Gut worms: +100% hunger rate factor
- Stoned on smokeleaf: +30% hunger rate factor
- Go-juice withdrawal: +50% hunger rate factor
- Malnutrition:
- Trivial: +50% hunger rate factor
- Minor: +60% hunger rate factor
- Moderate: +60% hunger rate factor
- Severe: +60% hunger rate factor
- Hunger pangs persona trait
: +50% hunger rate factor - Neural supercharger
: +20% hunger rate factor - Bio-starvation (outside of vat)
: +50% hunger rate factor
Multipliers
All of these modifiers stack multiplicatively with each other and with the hunger rate factor offsets listed above.
- Gourmand trait: ×150% hunger rate factor
- Stomach implants:
- Reprocessor stomach: ×75% hunger rate factor
- Nuclear stomach: ×25% hunger rate factor
- Reprocessor stomach
- Genetic metabolic efficiency : Positive metabolic efficiency reduces hunger by −10% per point. Negative metabolic efficiency increases hunger by +25% per point. Positive and negative metabolic efficiencies are added/subtracted from each other. Metabolic efficiency is effectively capped at -5 (×225%) and +5 (×50%). The final metabolic efficiency is used to determine hunger rate, and will stack multiplicatively with other hunger rate modifiers.
Despite its name and description, the Metabolism stat has no impact on hunger rate.
Overeating
Pawns will attempt to eat as their next action once their saturation level reaches 30% to avoid being hungry. Pawns make no effort to avoid "overeating", so any excess nutrition in the food is lost. A default pawn that eats a simple meal (0.9 nutrition) as soon as it is hungry (0.30 saturation) will go to 1.0 saturation and waste up to 0.20 nutrition of food (22% of the meal). In practice, the process of eating takes some time, so not all the food is wasted.
This effect is stronger in animals with lower body sizes - a Labrador retriever with 0.75 body size will get hungry at .1875 saturation and waste .3375 nutrition from the same simple meal. Smaller, more fungible food sources like berries or haygrass (0.05 nutrition) have less of this waste, as the waste will never exceed a single item's worth of nutrition.
This makes kibble and pemmican particularly useful as feed for smaller sized animals. These foods provide more nutrition than raw food, but won't be overeaten like a regular meal would.
Analysis
An adult baseline human will eat roughly 2 simple meals, 32 units of pemmican, or 32 units of raw food per day.
Cooking food effectively "creates" nutrition. A simple meal is worth 0.9 nutrition, but only costs 0.5 nutrition of food to make. This gives simple meals a 180% nutrition efficiency, before the overeating described above.
Due to the low food consumption of animals, as well as the efficiency of meals, it is possible to violate the laws of thermodynamics. For example, a female cow produces 
14 per day, or 0.7 nutrition in milk per day. A cow consumes 0.86 nutrition per day. While cows cannot consume milk, almost all animals can consume meals, no matter what the meal is made out of. So when a cow's milk is turned into nutrient paste meals or even simple meals, it can feed itself with plenty of food to spare. This gets even sillier with chickens, which produce more nutrition in eggs than it consumes per day, even before the eggs are cooked. (Note that chickens cannot eat their own eggs, and that they are very prone to overeating.)
Conserving food via malnutrition
In extreme situations, it may be advisable to stay in a hungry state to benefit from the reduced hunger. Note that this requires significant micromanagement to pull off. Forbid the food and unforbid it when pawns are about to fall unconscious.
Consider, for example, a human at 0% saturation and 0% malnourishment. This pawn has 0.9 nutrition (one simple meal) to eat.
If the food is eaten immediately, such human survives:
| Hours survived | State |
|---|---|
| 9.75 | Fed |
| 3.75 | Hungry |
| 7.50 | Ravenously hungry |
| 50 | Starving until death from malnourishment |
Giving a total of 71 hours alive.
If we instead let the human remain malnourished for 13.75 hours, before eating, the pawn survives:
| Hours survived | State |
|---|---|
| 13.75 | Starving up to 27.5% malnourishment (minor) |
| 3.75 | Fed state with 27.5–20% malnourishment (minor) |
| 2.50 | Fed state with 20–15% malnourishment (trivial) |
| 2.50 | Hungry state with 15–10% malnourishment (trivial) |
| 5.00 | Ravenously hungry state with 10–0% malnourishment (trivial) |
| 50 | Starving until death from malnourishment |
Giving a total of 77.5 hours alive.
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