Food and Treats for your Mice
Knowing the ideal diet for your mice will not only keep your mouse healthy, but also extend the lifespan of him/her.  It is important to provide your mouse with a healthy diet to avoid obesity which can lead to further complications such as diabetes.
Here is a list you can compare to your seed mix or lab block.  This is my idea of the ideal diet for mice given to me by a fellow mouse owner:
14% or less protein

4% or less fat/oil

AT LEAST 5% fiber (preferably more)

around 50% carbohydrates (starch and sugar)

low ash

and of course vitamins/minerals. (also can be added to water if seed mix does not contain suitable amount; minimizing magnesium)
When first caring for your mouse it is best to give them an unlimited amount of food.  Once you have an idea of how much they normally eat, then feed every evening. 1 tsp. per mouse is usually normal.
Treats that are not reccomended for mice:

Tomatoes (esp. stem parts - poisonous, but flesh is bad too)
Green veggies (good in moderation but can cause diarrhea)
Cabbage
Uncooked beans
Grass that's been sprayed with pesticide (obviously)
Onion
Raw meat
Too much cooked meat/eggs etc. (cause constipation)
Citrus fruits (a very tiny taste is probably ok)
Acidic fruits to excess (apples/pears/plums etc - we don't think
of them as acidic, but they are)
Lettuce (toxic to rodents in large amounts)
Parsley (poisonous in large amounts)
Rhubarb
Mushrooms
Many spices (especially, for example, nutmeg - a hallucinogen)
Fresh bread (should be stale)
Cow milk products including cheese (to excess)
Any plant you can't identify (obviously)
Anything you wouldn't eat yourself (i.e. day old leftovers)
Here's a list of treats that are perferable to a mouse:
The thing to keep in mind is that mice are grain eaters so anything grain based is usually ok.
stale bread (whole grain)         cooked or raw rice
oatmeal
most unsugared cereals
granola bars
unsalted crackers
sunflower seeds
hemp seeds
soy beans
cracked or dried corn
pumpkin seeds
Greens and fruits are good treats as well as long as you don't overdo it:

grasses rinsed in vinegar (clover, plantain, bladed, dandelion)
Carrots                         Zucchini
Grapes                         Celery
Squash                         Cooked corn
Cucumbers
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