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New research reveals that drinking just one cup of regular, black tea per day may help to protect against cardiovascular disease. The research, conducted at the University of L'Aquila in Italy and supported by the Lipton Institute of Tea, is the first study to show that black tea consumption does - depending on dose - improve blood vessel reactivity, reduce both blood pressure and arterial stiffness, indicating a notably better cardiovascular health profile

Dose response to vitamin D supplementation among postmenopausal African American women.\nTalwar SA, Aloia JF, Pollack S, Yeh JK.\nAm J Clin Nutr. 2007 Dec;86(6):1657-62.\nPMID: 18065583

March 11, 2009 -- Low vitamin D levels greatly increase a teenager's risk of diabetes and heart disease, Johns Hopkins researchers find. It is becoming clear that adults who get too little vitamin D are at higher risk for diabetes and heart disease. Now, it appears vitamin D levels also affect these risks earlier in life, say Johns Hopkins researchers Jared P. Reis, PhD, and colleagues.

Addition of milk prevents vascular protective effects of tea. Lorenz M, Jochmann N, von Krosigk A, Martus P, Baumann G, Stangl K, Stangl V. Eur Heart J. 2007 Jan;28(2):219-23. Epub 2007 Jan 9. PMID: 17213230 doi:10.1093/eurheartj/ehl442 In conclusion, milk may counteract the favourable health effects of tea on vascular function. The finding that the tea-induced improvement of vascular function in humans is completely attenuated after addition of milk may have broad implications on the mode of tea preparation and consumption. In addition, it indicates that caution is warranted in the design of studies involving nutritional flavonoids.