There are two sources of acidity/alkalinity in foods and drinks:
* the acids that leave no ash when burnt.
* the minerals that leave ashes when burnt. They include alkaline ashes (sodium, potassium, calcium, magnesium, iron, manganese, copper, zinc, selenium ash) and acid ashes (chloride, phosphorus and sulfur ash).
There are two schools of thought about the impact of foods and drinks on the ph of our bodies:
s1. The ph of a foods and drinks in their natural states is what counts. For example, tomatoes have ph=4~5. Therefore tomatoes are acid food.
S2. Ignore the acids that leave no ash. The minerals that leave ashes are the only ones that impact our body ph. For example, tomatoes have more alkaline ashes than acid ashes, therefore, tomatoes are alkaline food.
S2 has some problems. For example:
* first of all, we eat tomatoes and not tomato ash.
* before tomatoes are digested and absorbed in the intestine, their ph have to be raised to 7 in duodenum (first part of small intestine). This requires alkaline pancreatic juice, therefore, tomatoes use up some of the body's alkaline store. Furthermore, when acids in tomatoes are metabolized they produce co2. Unlike burning the acids in tomatoes in the open space where co2 disappears in the thin air, co2 is trapped inside our bodies and turns into carbonic acid (h2co3) and lowers our body ph. Hence, tomatoes are acid food.
* commercial vinegar is 4~8% solution of acetic acid (hc2h3o2) in water which leaves no ash when burnt. If s2 is correct, we can safely replace drinking water with high strength of acetic acid in water. If we try this, I am sure we will get sick very quickly. Hence, s2 cannot be correct.
* when we consume acidic foods or drinks, the acids in them, or their metabolites, compete with uric acid (ua) for excretion in the kidneys, reduce the amount of ua excreted, and elevate the blood ua levels. This can cause the imbalance of the ua levels between the blood and the joint fluid and result in shedding of the protein coatings on monosodium urate (msu) crystals in the problem joints to trigger gout attacks. If s2 is correct, tomatoes should not trigger gout attacks. But they do.
Therefore s2 is incorrect.
Cherry tomatoes produce fruits earlier (in 60 days) than larger tomatoes, e,g. Beefsteak (in 100 days). Therefore, cherry tomatoes have shorter photosynthesis life and produce more potent gout triggering acidic fruits. The ph of cherry tomato is 4.0, beefsteak 4.6, roma and vita gold 5.1, and super marzano 5.2. That means cherry tomatoes are 4 times as acidic as beefsteak, 12.6 times as roma and vita gold, and 15.8 times as super marzano. This explains why cherry tomatoes trigger gout attacks in some people whereas large tomatoes do not bother them.
Tomatoes are low in purines. They trigger gout due to their low ph.