Koliko vitaminov vsebuje toplotno obdelano sadje in zelenjava?

Odvisno katero sadje in zelenjava. Nekatere imajo po kuhanju celo več "vitaminov".

A ni najprej vprašanje koliko vitaminov sploh še vsebujeta sadje in zelenjava?

A Kushi Institute analysis of nutrient data between 1975 to 1997 found that average calcium levels in 12 fresh vegetables dropped 27 percent; iron levels 37 percent; vitamin A levels 21 percent, and vitamin C levels 30 percent. A similar study of British nutrient data from 1930 to 1980, published in the British Food Journal,found that in 20 vegetables the average calcium content had declined 19 percent; iron 22 percent; and potassium 14 percent, Vitamin A 87 percent.

Take the potato, by far the most consumed food in Canada. The average spud has lost 100 per cent of its vitamin A from 1951, which is important for good eyesight; 57 per cent of its vitamin C and iron, a key component of healthy blood; and 28 per cent of its calcium, essential for building healthy bones and teeth. It also lost 50 per cent of its riboflavin and 18 per cent of its thiamine. Of the seven key nutrients measured, only niacin levels have increased. The story is similar for 25 fruits and vegetables that were analyzed.

Percentage change in the nutrient content of fruits and vegetables in Canada between 1951 and 1999.

Food...... Calcium... Iron... Vitamin A.. Vitamin C.. Thiamine.. Riboflavin.. Niacin

Apple       20.0   -55.3     -41.1      16.0      -75.0      -66.7     -30.0
Banana     -23.8   -41.7     -81.2     -13.0          0     -100.0      -1.4
Broccoli   -62.8   -33.9     -55.9     -10.1      -40.0      -42.9      -2.7
Onion      -37.5   -52.9    -100.0     -54.8       56.9      -41.2     135.3
Potato     -27.5   -58.6    -100.0     -57.4      -14.6      -50.0      44.9
Tomato     -55.7   -18.8     -43.4      -1.6          0       21.8      46.3

BuDi79 je 4. jun 2020 ob 12:31 izjavil:

A ni najprej vprašanje koliko vitaminov sploh še vsebujeta sadje in zelenjava?

A Kushi Institute analysis of nutrient data between 1975 to 1997

A to je reklama za vitamine v tabletah?

"A ni najprej vprašanje koliko vitaminov sploh še vsebujeta sadje in zelenjava?"

Dobro vprašanje.

Npr. paradižnik in solata, ki rasteta v kameni volni, hranila pa dobivata iz umetnih gnojil v vodi - hidroponika.