As of 33.19, tests have been run by myself on 4 different subjects, all on a same save file. Game mode was 1st Week - Hardcore. Subjects got to forage the forest and eat different types of berries, 3 by 3 each time, and wait at least 5 hours between 2 doses. Here are the results : Seems like only one type of berries is randomly designed to be poisonous each time you create a new character. Note also that Lemon Grass (1 dose) was enough to take the poison off of 3 units of berries, although we need more informations on that fact. More tests will be done soon, and on mushrooms as well. All subjects died within 4 hours after eating poison. Conclusion is : if you are not a Herbalist you should avoid eating berries at any time, for the risk of being poisoned is too high.