Whilst the above may be correct for RAW Garlic and onion, the same cannot be said for these items when they are properly cooked. Onion is actually beneficial to the stomach when cooked and aids digestion as does cooked garlic. Garlic and onion powders are rarely 100% of either and they only contain dried product which strips the beneficial functions from their chemical constituents. Anyone who regularly experiences excessive hunger, gum bleeding and foul breath, stomach ulcers (or stomach bleeding), reflux or hypertension (high blood pressure) should avoid garlic in any form. Those who have poor appetite, weak digestion, bloating/gastric wind or cold limbs (even when feeling warm) can benefit strongly from small amounts of these foods consumed daily with other spices such as cumin seeds, coriander seeds and turmeric. Both Ayurvedic and traditional Chinese medicine support this, both of which originate in the time of the Gods being on earth. HOWEVER, we are all different and things affect each of us differently. If you can isolate a problem with the consumption of either within yourself than it is absolutely recommended that you stop or reduce its consumption. HAIL SATAN!