Do the buffs from eating food in Genshin Impact stack?

Question

There are several kinds of buffs provided by food in the game. There are defensive and offensive food, which raises stats of things like defense, attack, crit rate, and crit damage. There are utility consumables which up specific elemental damage, or increases resistance to particular elements for a short duration, or decreases stamina consumption or restores flat stamina.
Do all these buffs stack? Are they all treated as separate instances of buffs? Or do some buffs override each other? For instance, do attack buffs from food stack? Does a greater amount of attack always override another attack buff?  Does the same logic apply for hybrid foods which apply offensive buffs in multiple categories (ie Adeptus Temptation, which buffs both Attack and Crit Rate).

arghtype · Answer

TL;DR:

All food buffs fall into 3 categories - offensive, defensive, utility. For each category only 1 food buff could be active.
Latest consumed food always overrides previous buff in the same category. Stars don't matter - you can override your 5* Adeptus Temptation with any 2* soup and 5* buff will be replaced with inferior version.
Flat stats buffs (like ATK +100) do not benefit from your ATK% equipment - you will always receive flat bonus (+100 in this example).

I did the following test: I consumed food items one after another and took notes of my char stats:

Exp#
Food Consumed
Stats

0

ATK 2528 CC 33,4 DEF 832

1
2* ATK +81
ATK 2609 CC 33,4 DEF 832

2
2* DEF +107
ATK 2609 CC 33,4 DEF 939

3
2* CC  +9%
ATK 2528 CC 42,4 DEF 939

4
2* ATK +81
ATK 2609 CC 33,4 DEF 939

5
3* ATK +194
ATK 2722 CC 33,4 DEF 939

6
4* ATK +320 CC +10%
ATK 2848 CC 43,4 DEF 939

7
2* ATK +81
ATK 2609 CC 33,4 DEF 939

In experiment #2 we see that offensive and defensive buffs can be active at the same time.
In experiment #3 we see that different offensive buffs do not stack - Critical Chance buff replaces Attack buff.
In experiments #4-7 we see that each consequent offensive buff overrides previous. And unfortunately 2* can override 4*.
Stamina reduction food has their own category, and it's possible to keep all 3 categories buffs up at the same time, see buff icons are present for current character and for the entire party:

Regeneration items can be used at the same time, but they don't have any icon - you can only see green glow around your character.

Do the buffs from eating food in Genshin Impact stack?

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Exp#	Food Consumed	Stats
0		ATK 2528 CC 33,4 DEF 832
1	2* ATK +81	ATK 2609 CC 33,4 DEF 832
2	2* DEF +107	ATK 2609 CC 33,4 DEF 939
3	2* CC +9%	ATK 2528 CC 42,4 DEF 939
4	2* ATK +81	ATK 2609 CC 33,4 DEF 939
5	3* ATK +194	ATK 2722 CC 33,4 DEF 939
6	4* ATK +320 CC +10%	ATK 2848 CC 43,4 DEF 939
7	2* ATK +81	ATK 2609 CC 33,4 DEF 939