紫胡萝卜也许效果更好，不用吃那么多。喜鹊用的红胡萝卜含有较高的番茄红素（lycopene), 有研究表明对某些癌症有效。
purple carrots have SIX TIMES the amount of falcarinol found in their orange counterparts. Falcarinol is one of the active chemical compounds found in carrots that nature has created to destroy both fungus and cancer cells.
胡萝卜的前世今生：
https://www.businessinsider.com/carrots-used-to-be-purple-before-17th-century-2014-6
Purple carrots contain anthocyanins, which are flavonoids;
red carrots are a source of lycopene and
yellow carrots contain lutein, both carotenoids.
from http://www.aicr.org/enews/2016/09-september/enews-latest-research-cancer-fighting-carrots.html
Lycopene: New Cancer Prevention Studies
https://www.lifeextension.com/Magazine/2018/5/Cancer-Prevention-Effects-Of-Lycopene/Page-01
Summary (from the above link)
Lycopene has demonstrated direct effects on the steps involved in tumor development and growth—especially invasion and metastasis.
Evidence published over 30 years ago indicated that people who consumed higher amounts of lycopene from food had lower specific-site cancer rates.1-4
In recently published studies, lycopene has been found to combat a variety of cancers, including colorectal, ovarian, and skin cancers.
Lycopene may even enhance the effect of chemotherapy drugs, potentially reducing the dose necessary to achieve a successful remission.
Based on its varied beneficial effects on factors involved in malignant transformations, the evidence for lycopene’s anticancer properties continues to expand.
