Jason suffered painful withdrawal symptoms after he stopped using heroin. this was most likely due to his brain's reduced production of

Most likely due to the reduced production of endorphins

Anxiety, stress, or something like that

1. b vitamins2. vitamin k3. vitamin d4. examples are walnuts, seeds, tofu5.  total fat, saturated fat, trans fat, cholesterol, sodium, total carbohydrate, dietary fiber, sugars, protein, vitamin a, vitamin c, calcium, and iron.6. 11257. they have to contain reliable information8. less than 10%  9. i didnt read the course so im not surehope that : p