How many handfuls of baking soda can you eat at one time without fear of overdosing?

If you take too much baking soda, or any antacid medication, then the stomach acid itself can be neutralized. The result is that the stomach cells produces more acid to compensate. You then end up taking more baking soda or antacid to neutralize the excess acid. Eventually you can exhaust the stomach cells and the level of stomach acid can decline. Great for your heartburn perhaps, but not so good for your digestion. The level of stomach acid can fall so much that it impairs digestion and food cannot be broken down properly. The result of this can be allergies and inflammation in other areas of the body.

Baking sodas active ingredient is sodium bicarbonate. I have found several cases in which so much was ingested that the brain will swell (because of the excess salt) and death will occur. There are also a limited number of references to ruptured stomachs. Probably not a good thing to try.

1 more thing. Since this is in diet and fitness I thought I'd mention that the practice of "soda loading" does not work. It has no basis in fact. If that is what you were wondering.

Without flour and baking powder, yes~without baking soda, no . 1 c peanut butter 1 c sugar 1 egg 1 t soda Beat egg well with sugar and soda. Stir in peanut butter. Let mixture sit 15 mins at room temperature. Roll by teaspoons into balls~ do not flatten. Bake at 325 for 10 mins.

If you have to ask, don't do it.