phytochemicals

What plant compound found in turmeric and mustard is considered a phytochemical?

Curcumin

What foods are major sources of phytoestrogens?

Soy and flax

What is the more accurate statement about antioxidants, phytochemicals, and cancer cells?

They may reduce oxidative stress and inflammation, but the idea that they directly kill cancer cells is more complex.

What antioxidant supplement still does not have clearly established benefits at high doses?

Vitamin E

What does the lecture say about vitamin C supplements and disease prevention?

There is no convincing evidence that vitamin C supplements prevent disease.

What carotenoid is found in tomatoes and watermelon?

Lycopene

What do darker greens contain more of?

Beta-carotene

What does beta-carotene help neutralize as an antioxidant?

Harmful free radicals

What vitamin is beta-carotene a precursor for?

Vitamin A

What are phytosterols structurally similar to?

Cholesterol

What do phytosterols reduce in the body?

Cholesterol absorption

What type of cholesterol can phytosterols help lower?

LDL cholesterol

Why are phytosterols found in human blood and tissues only from food?

Humans cannot synthesize phytosterols.

What are the two classes of phytosterols?

Plant sterols and plant stanols

What distinguishes plant sterols from plant stanols?

Plant sterols have a double bond in the sterol ring, while plant stanols lack a double bond.

How does the typical Western diet compare to early human diets in phytosterol content?

The typical Western diet is relatively low in phytosterols.

What is the effect of daily phytosterol consumption from enriched foods?

It can significantly lower LDL cholesterol.

How much can an average phytosterol intake of 2 g/day lower LDL cholesterol?

About 8% to 10%

What sulfur-containing phytochemicals are found in cruciferous vegetables?

Indoles, isothiocyanates, and alliums

What action helps form bioactive compounds from raw cruciferous vegetables?

Chopping or chewing them

How can bioactive compounds form from cooked cruciferous vegetables?

Gut bacteria generate them after ingestion.

When has high cruciferous vegetable intake been associated with increased thyroid cancer risk?

Only in iodine-deficient areas.

What food is especially associated with sulforaphanes?

Broccoli

What do sulforaphanes stimulate in the body?

Enzymes that detoxify carcinogens

What part of broccoli is a concentrated source of the precursor for sulforaphane?

Broccoli sprouts

What are discarded parts of certain vegetables more potent at blocking?

Abnormal angiogenesis

What is angiogenesis?

The formation and differentiation of blood vessels.

Which usually discarded vegetable parts were described as twice as potent against abnormal angiogenesis?

Broccoli stalks and carrot greens

Compared with broccoli florets and carrot roots, how potent are broccoli stalks and carrot greens against abnormal angiogenesis?

They are twice as potent.

What happens to sulfur compounds in garlic when cells are ruptured?

They become volatile.

What does the lecture say about raspberry ketones and weight loss?

There is no evidence that raspberry ketones support weight loss in humans.

What are polyphenols?

Plant non-nutrient natural products.

What qualities can polyphenols be responsible for in plant foods?

Aroma, color, and antioxidant properties.

What type of chemical agents are polyphenols?

Reducing agents.

What are polyphenols referred to as when grouped with vitamin C, vitamin E, and carotenoids?

Antioxidants

What are some food sources of quercetins listed in the lecture?

Onions, scallions, and kale

What risk is linked to high-dose green tea dietary supplements?

Liver dysfunction

What does the lecture say about phytochemicals in concentrated doses?

Evidence is insufficient to say whether they are effective in fighting disease or safe in concentrated doses.

What polyphenol is found in turmeric?

Curcumin

What does the lecture say about polyphenol levels in plain teas?

All plain teas have about the same levels, except decaffeinated tea.

What polyphenolic compounds are abundant in olive oil?

Oleuropein, hydroxytyrosol, and their derivatives.

What is the most abundant type of flavonoid mentioned in the lecture?

Anthocyanins

Where are anthocyanins found?

Red and blue colored berries and red cabbage.

What phytochemical in black soybean is studied for potential health effects?

Anthocyanins

What is the main takeaway about the best source of phytochemicals?

They are best obtained from whole foods.

What does the lecture say about phytochemical supplements compared with whole foods?

Supplements may not provide the same benefits.

What overall diet pattern is emphasized in the key takeaways?

A balanced diet is essential.