1. Caffeine constricts the blood vessels in your body.

2. I discovered I was hypersensitive to caffeine.

3. Caffeine can cause palpitations and headaches.

4. The caffeine in coffee can jangle the nerves.

5. I'm trying to cut down on caffeine.

6. Caffeine is bad for your health.

7. It is a well-known fact that caffeine is a stimulant.

8. Avoid caffeine before bedtime.

9. As little as 50mg of caffeine can produce pharmacological effects.

10. Caffeine, which is found in coffee and tea, is a mild stimulant.

11. Caffeine is the active constituent of drinks such as tea and coffee.

12. I need my fix of caffeine in the morning or I can't think.

13. Another possibility is that caffeine affects skeletal muscles indirectly.

14. In fact, caffeine is arguably the safest recreational drug.

15. Caffeine received no better press in the twentieth century.

16. Half of the subjects were given caffeine.

17. The caffeine in coffee is mildly addictive.

18. Pregnant women should reduce their intake of caffeine.

19. Still, caffeine is not aspirin.

20. Avoid caffeine three to four hours before bedtime.

21. Also: no caffeine, nicotine, alcohol or recreational drugs.

22. And they can be altered by caffeine use, stress, and the amount of fat under the skin.

23. Even moderate doses of caffeine can set off this peristalsis whether or not the body was ready to dispose of its feces.

24. The connection between caffeine and religious devotion also figures prominently in one of the common legends about coffee.

25. The evidence of developmental problems arising from lower levels of caffeine consumption is less clear.

26. Arabica beans are harder to grow, produce more flavorful coffee, and contain about half the caffeine of robusta beans.

26. Wish you can benefit from our online sentence dictionary and make progress every day!

27. This removal is very effective because methylene chloride and other caffeine solvents evaporate at temperatures between 100 and 120 degrees.

28. As interesting as such examples are, of course, they in no way prove that caffeine actually improves mental functioning.

29. Some scientists believe there may be a link between caffeine and heart disease.

30. Women may respond to the unpleasant feelings associated with the peak progesterone levels by increasing their caffeine intake.

1. Caffeine constricts the blood vessels in your body.

2. I discovered I was hypersensitive to caffeine.

31. In one study, the half-life of caffeine in premature infants ranged from 41 to 231 hours.

32. Unlike caffeine, these molecules have only two methyl groups attached to their xanthine skeleton.

33. Under the influence of a pint of caffeine the world seemed a friendlier place.

34. Women who nurse their infants need to be careful as well because babies lack the liver enzymes needed to break down caffeine.

35. On the Rebound Since caffeine is relatively inexpensive and widely available, the dose escalation induced by tolerance is seldom burdensome.

36. As cocoa contains caffeine, it would have stimulated the Temperance workers on their way.

37. In many ways, caffeine is in a different league from other recreational drugs.

38. But both of these contain caffeine and other chemical stimulants which are quickly absorbed into the bloodstream.

39. When caffeine blocks these receptors, blood vessels dilate, increasing the filtration rate and producing more urine.

40. But as a headache remedy, caffeine can be tricky to manage.

41. Obvious examples include caffeine and ephedrine, the latter being readily available to the public in over-the-counter cold remedies.

42. Theophylline is roughly as potent as caffeine; theobromine is seven times weaker than either.

43. And yet, despite its safety and mildness relative to other recreational drugs, caffeine still unquestionably alters brain function.

44. Progress in learning how alcohol and caffeine work has had to wait for new knowledge of how the brain works.

45. But unlike the action in the kidney, where caffeine causes a dilation, in the colon it causes a constriction.

46. The standard dose of alcohol is thus roughly 142 times larger than the standard dose of caffeine.

47. In any case, the current legal limits for caffeine are sufficiently high to allow a wide latitude of experimentation.

48. Yes, especially the spice and green teas-and they managed it without the caffeine too.

49. Out of ninety-nine people screened for the study, sixteen were diagnosed as caffeine dependent after undergoing a battery of evaluations.

50. She needed the hot draught of caffeine to clear her head.

51. But only in the past several years have neuroscientists made much progress in illuminating how caffeine revs up the brain.

52. Caffeine also directly affects many parts of the body by attaching to adenosine receptors found outside the brain.

53. Some of the new findings, though, support previously unsubstantiated folk wisdom about alcohol and caffeine.

54. Since caffeine is usually consumed in beverages, the liquid by itself will result in an increased urge to urinate.

55. How is it, then, that caffeine is found in plants as unrelated as certain species of lilies and cacti?

56. Many brands of aspirin and aspirin substitutes include a significant dose of caffeine.

57. It was only after the caffeine began to work that he realized that everyone was kind of waiting for something to happen.

58. These results suggest that caffeine indirectly affects many neurotransmitter systems through its direct effects on adenosine receptors.

59. In the United States,[] alcohol is second only to caffeine as the drug of choice.

60. In short, recent scientific progress has revolutionized the understanding of alcohol and caffeine.

61. The disruptive effects of alcohol on sleep can be exacerbated by caffeine.

62. Drinking a caffeine-containing beverage in the morning may help also be-cause caffeine constricts cerebral blood vessels.

63. Neurons bathed in modest levels of caffeine respond more vigorously to stimulation and form longer-lasting changes in their connections with other neurons.

64. Women who consume large amounts of caffeine are more likely to give birth to underweight babies.

65. First, since nicotine is a central nervous system stimulant, it produces almost the same effects on the body as caffeine.

66. This now appears to be one way the brain reacts to caffeine.

67. Drink: It is well-known that tea and coffee contain caffeine and that caffeine is a stimulant.

68. Of course, tolerance to very heavy doses of caffeine may be problematic for health reasons.

69. One consequence of this lumpiness is that caffeine is far more selective in its actions than is alcohol.

70. It is theoretically possible that caffeine somehow inhibits parts of the brain, such as the hypothalamus, involved in regulating appetite.

71. Thus, with the exception of water, all of the most popular beverages on earth contain either caffeine or alcohol.

72. Out of this new insight has come a radically improved understanding of how alcohol and caffeine work.

73. Nobody at that time had the slightest idea about how caffeine affected the body.

74. Caffeine has long been used to increase physical endurance, in both humans and animals.

75. By altering the brain, caffeine automatically alters all systems regulated by the brain.

76. This is why caffeine is the active ingredient in many prescription and nonprescription migraine treatments.

77. Regardless of the causative agent(), the tremors and twitches experienced by some users of caffeine are usually harmless.

78. It appears that chronic caffeine use may cause up-regulation or down-regulation of other neurotransmitter systems as well.

79. Another well-known effect of caffeine is increased hand tremor, which has been measured in numerous experiments.

80. Some even insert caffeine suppositories before a race in an attempt to provide a sustained dose with no stomach upset.

81. In fact, theobromine is seven times more abundant than caffeine in chocolate-about 130 milligrams in a 1-ounce piece.

82. In short, there is no simple answer to whether caffeine is, or is not, helpful in performing intellectual tasks.

83. When you first stop taking caffeine, you may experience withdrawal symptoms.

84. Some experiments on skeletal-muscle strips have demonstrated that caffeine increases contractions, which might seem to explain some of the twitch phenomena.

85. But people tend to drink caffeine on a regular basis over long periods of time-often the greater part of a lifetime.

86. Mountain Dew -, for instance,[http:///caffeine.html] contains 54 milligrams of caffeine per can.

87. Even if every adenosine receptor in your brain were blocked by caffeine, you could still function.

88. The people consuming the caffeine demonstrated tolerance in several ways.

89. Whether caffeine is the root cause of your insomnia or just a contributing factor, your caffeine consumption needs to be addressed.

90. Not surprisingly, the studies of caffeine tolerance and withdrawal have found wide variations in subject responses.

91. The side effects of the long-term use of caffeine are mild but extensive.

92. One of the better-known brands, Cafergot, contains 100 milligrams of caffeine in each tablet or suppository.

93. Interestingly enough, caffeine does have some demonstrable effects that, at least theoretically, could help dieters.

94. Several studies have demonstrated that sperm exposed to caffeine swim faster and more energetically than normal.

95. Rossignol and Phillis theorize that this pattern of caffeine use may reflect an unsuccessful attempt by the women to self-medicate with caffeine.

96. You put caffeine behind some other drug you've got inside you, and it gives that drug a kick.

97. Exactly how caffeine boosts physical performance is still not clear.

98. Caffeine enemas are given four hourly, as well as castor oil - orally or by enema - to aid detoxification.

99. Not only must the caffeine be eliminated, but the break-down products have to be eliminated as well.

100. For reasons that remain obscure, caffeine significantly increases the analgesic effectiveness of both aspirin and aspirin substitutes such as acetaminophen.

101. I own at least six caffeine delivery systems from a Melita to an espresso machine.

102. He was told to gradually cut these out, along with all other drinks containing caffeine.

103. As we will see in more detail in the next chapter, the body adapts quickly to caffeine.

104. This is especially-true for insomniacs, who seem to have a lower tolerance to the stimulating effects of caffeine than most people.

105. But without a doubt, caffeine affects the rest of the body as powerfully as it affects the brain.

106. But the results are intriguing because they seem to indicate that caffeine is affecting more than just adenosine receptors in the brain.

107. In the social context, drugs such as caffeine, sugar and chocolate are well accepted and much enjoyed by millions worldwide.

108. This double-speed elimination of caffeine may explain the long-standing observation that smokers drink more coffee than nonsmokers.

109. The amount of caffeine should be reduced gradually, over a period of two to three weeks, to minimize withdrawal reactions.

110. Such findings suggest that famous coffee drinkers such as Bach and Kant may have derived little help from their caffeine habits.

111. Caffeine has been shown to have a good effect on mental performance.

112. The Internet is just one more damn thing we have to monitor, like television, movies, video games and caffeine.

113. But for athletes and others who are likely to perspire heavily, excessive consumption of caffeine could lead to dehydration.

114. Caffeine, nicotine and alcohol are major culprits because they make blood vessels contract.

115. These were meat eaters who admitted to not caring about their intake of salt, sugar, caffeine or calories.

116. In fact, for some people, caffeine may actually make it harder to eat a balanced, healthy diet.

117. The survey asked how the patients felt as well as what their typical intake of caffeine was before the surgery.

118. Through the centuries, millions of people have used caffeine to help spark creative thought.

119. These new findings about caffeine explain some of the ordinary experiences of drinking coffee, tea, and other caffeinated beverages.

120. This tighter fit enables caffeine to plug the receptor, thus preventing adenosine from binding.

121. Attention originally focused on the way caffeine affects muscle contraction and reflexes.

122. Second, the story is a reminder that caffeine, like alcohol, freely crosses the placenta.

123. Cola nuts have caffeine in them.

124. Avoid caffeine or alcohol; memorise your shopping list.

125. Caffeine can improve alertness and concentration in moderate doses.

126. Now there are cola drinks without caffeine.

127. As a rule of thumb, a cup of filter coffee contains about 80mg of caffeine.

128. Increase your intake of non - alcoholic , non - carbonated , caffeine free beverages such as water and juice.

129. "What we have done for the first time is show what kind and how many -- at least four -- enzymes there are that break down caffeine by N-demethylation in bacteria," Summers said.

130. Caffeine, a purine alkaloid, is a key component of tea and coffee.

131. Aniston adopts clean-living lifestyleJennifer Aniston is embarking on a new healthy lifestyle and has cut out cigarettes and eliminated caffeine from her diet.

132. Caffeine and other stimulants cannot overcome the effects of severe sleep deprivation.

133. Caffeine, phenobarbital, aminopyrine and phenacetin in antipyretic analgesic were determined using two-point internal standard method.

134. This article discusses the development on the experiment of caffeine extraction. The new subminiature device and method were adopted in caffeine extraction.

135. Actually, we are not forbidden from drinking colas. I personally try to avoid caffeine.

136. Community College credo: fix anything with duct tape, eat only ramen noodles, drink only caffeine.

137. Lingyun Baekho tea with caffeine 4.91 % , 3.63 % amino acids, tea polyphenols 35.6 %.

138. Caffeine can inhibit lung pant for parasympathetic nerve, reduce asthma attacks.

139. "Chocolate contains many substances that act as stimulants, such as theobromine, phenethylamine, and caffeine," Dr. Bryan Raudenbush from Wheeling Jesuit University in West Virginia.

140. Caffeine intake was associated with a significantly lower risk for AD , independently of other confounding variables.

141. The harmful effects of caffeine had long been documented in textbooks.

142. Contains: Organic Ginger root, organic Cinnamon, organic Cloves, organic Cardamom, organic Nutmeg, organic Darjeeling , and organic Vanilla bean. Contains Caffeine.

143. Caffeine is by far the best and safest natural stimulant.

144. In an experiment, volunteers who had consumed 'high levels' of caffeine thought they were listening to Bing Crosby singing White Christmas even though the song was not being played.

145. The shaking inside may be due to low blood sugar, too much caffeine or too many cigarettes.

146. Objective : To study the psychological effect of long - term caffeine sodium benzoate use.

146.

147. Using 1 % calcium oxide has more single caffeine production rate, extraction rate and purity.

148. Objective To study the effect of electric field direction on the percutaneous penetration of the non-ionic drug caffeine mediated by skin electroporation and iontophoresis.

149. Objective:To explore new methods for the determination of aminopyrine and caffeine in Naoningpian.

150. CLAIRE: [ to Jerry ] Don't worry, I gave him a little caffeine: he'll perk up.

151. The primary bulk pharmaceuticals produced are: Caffeine, Theophylline, Aminophylline, Metronidazole , Metronidazole benzoate, Secnidazaole and Nifedipine.

152. So much so that the total intake of caffeine appears to be related to sleep problems, according to a new study by the University of Nebraska Medical Center.

153. Beans are steamed, so that dissolved caffeine rises to the surface, where it is washed off using an organic solvent called methylene chloride.

154. The puking, she was told, was part of the detox (which feels much worse if you're a caffeine addict).

155. Signs of caffeine over-stimulation in a baby can be atypical alertness, short sleep sessions, fussiness, and irritability.

156. The leaves of an American holly can be used to make a popular caffeine - rich tea.

157. And, similarly to caffeine,[ ] people who have high blood levels of this B vitamin may see less decline in their verbal skills as they age.

158. LONDON (Reuters) - Caffeine addiction is such a downer that regular coffee drinkers may get no real pick-me-up from their morning cup, according to a study by British scientists.

159. Caffeine is removed by directly soaking the materials in the methylene chloride .

160. They appear appeal mainly to young people and are fueled mainly by caffein caffeine.