Tea Weight Control and Thermogenesis

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Black, green, and oolong teas, perhaps because of their limited caffeine content, have been found to increase thermogenesis, to inhibit lipases, and to control body weight and body fat (Table 12; see also Table 9) (87,145-151). The relevant mechanism may be an effect on fat cell synthesis and the endocrine system, modulated by leptin. Green tea and caffeine increased physical activity and lowered body fat in mice. Also, tea, especially epigallo-

TABLE 12 Effect of Oral Administration of Caffeinated Beverages on the Thickness of the Dermal Fat Layer Under Tumors of Different Sizes in SKH-1 Mice Previously Treated with UV (High-Risk Mice)

Thickness of dermal fat layer under tumors (urn)

TABLE 12 Effect of Oral Administration of Caffeinated Beverages on the Thickness of the Dermal Fat Layer Under Tumors of Different Sizes in SKH-1 Mice Previously Treated with UV (High-Risk Mice)

Thickness of dermal fat layer under tumors (urn)

Tumor

Noncaffeinated

diameter

plus caffeinated

Noncaffeinated

Caffeinated

Percent

(mm)

beverages3

beveragesb

beveragesb

decrease

<0.5

58 + 3 (202)

70 + 4 (100)

45 + 2 (102)

36

0.5-1

49 + 3 (204)

63 + 3 (125)

27 + 2 (79)

57

1-2

43 + 3 (177)

54 + 3 (125)

16 + 2 (52)

70

2-3

31 + 5 (56)

39 + 5 (42)

4 + 1 (14)

90

>3

24 + 5 (50)

34 + 6 (35)

1 + 1 (15)

97

Mean value

47 + 1 (689)

58 + 2 (427)

29 + 2 (262)

50

UV-pretreated high-risk SKH-1 mice were treated orally with noncaffeinated beverages (water, dGT, dBT) or caffeinated beverages (GT, BT, CF, dGT + CF, and dBT + CF) for 23 weeks as described in Table 1. The thickness of the dermal fat layer under tumors of different sizes was measured in all 152 tumors-bearing mice (67 mice from the noncaffeinated beverage groups and 85 mice from the caffeinated beverage groups). The values in parentheses indicate the number of tumors studied. The mean value for the thickness of the dermal fat layer under tumors ± Se is given for tumors of different sizes. a There was a significant negative linear association between tumor diameter and the log thickness of the dermal fat layer under tumors (p = 0.0001) using the random coefficient (hierarchical linear) model.

b The rate of decrease in thickness of the dermal fat layer under tumors of increasing size in mice treated with caffeinated beverages was significantly greater than that for mice treated with the noncaffeinated beverages (p = 0.0001) using the random coefficient (hierarchical linear) model. Source: Ref. 87 (see Table 9).

UV-pretreated high-risk SKH-1 mice were treated orally with noncaffeinated beverages (water, dGT, dBT) or caffeinated beverages (GT, BT, CF, dGT + CF, and dBT + CF) for 23 weeks as described in Table 1. The thickness of the dermal fat layer under tumors of different sizes was measured in all 152 tumors-bearing mice (67 mice from the noncaffeinated beverage groups and 85 mice from the caffeinated beverage groups). The values in parentheses indicate the number of tumors studied. The mean value for the thickness of the dermal fat layer under tumors ± Se is given for tumors of different sizes. a There was a significant negative linear association between tumor diameter and the log thickness of the dermal fat layer under tumors (p = 0.0001) using the random coefficient (hierarchical linear) model.

b The rate of decrease in thickness of the dermal fat layer under tumors of increasing size in mice treated with caffeinated beverages was significantly greater than that for mice treated with the noncaffeinated beverages (p = 0.0001) using the random coefficient (hierarchical linear) model. Source: Ref. 87 (see Table 9).

catechin gallate, but not caffeine, raised insulin activity (152,153). Conceptually, those findings may be important in light of the fact that obesity is increasing, and general adoption of a health-promoting beverage, tea, may be a relatively simple means of assisting control of body weight with an otherwise healthy nutritional tradition.

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