Definition of caffeine noun from the Oxford Advanced Learner's Dictionary

 

caffeine

 noun
noun
BrE BrE//ˈkæfiːn//
 
; NAmE NAmE//ˈkæfiːn//
 
[uncountable] Addiction
 
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a drug found in coffee and tea that makes you feel more active Try to avoid too much caffeine. drinks that are high in caffeine CollocationsDiet and exerciseWeight put on/​gain/​lose weight/​a few kilos/​a few pounds watch/​control/​struggle with your weight be/​become seriously overweight/​underweight be/​become clinically/​morbidly obese achieve/​facilitate/​promote/​stimulate weight loss slim down to 70 kilos/(British English) 11 stone/(especially North American English) 160 pounds combat/​prevent/​tackle/​treat obesity develop/​have/​suffer from/​struggle with/​recover from anorexia/​bulimia/​an eating disorder be on/​go on/​follow a crash/​strict diet have/​suffer from a negative/​poor body image have/​develop a positive/​healthy body imageHealthy eating eat a balanced diet/​healthily/​sensibly get/​provide/​receive adequate/​proper nutrition contain/​get/​provide essential nutrients/​vitamins/​minerals be high/​low in calories/​fat/​fibre/(especially US English) fiber/​protein/​vitamin D/​Omega-3 fatty acids contain (no)/use/​be full of/​be free from additives/​chemical preservatives/​artificial sweeteners avoid/​cut down on/​cut out alcohol/​caffeine/​fatty foods stop/​give up/ (especially North American English) quit smokingExercise (British English) take regular exercise do moderate/​strenuous/​vigorous exercise play football/​hockey/​tennis go cycling/​jogging/​running go to/​visit/ (especially North American English) hit/​work out at the gym strengthen/​tone/​train your stomach muscles contract/​relax/​stretch/​use/​work your lower-body muscles build (up)/gain muscle improve/​increase your stamina/​energy levels/​physical fitness burn/​consume/​expend caloriesStaying healthy be/​get/​keep/​stay healthy/​in shape/(especially British English) fit lower your cholesterol/​blood pressure boost/​stimulate/​strengthen your immune system prevent/​reduce the risk of heart disease/​high blood pressure/​diabetes/​osteoporosis reduce/​relieve/​manage/​combat stress enhance/​promote relaxation/​physical and mental well-being see also decaffeinated See related entries: Addiction Word Origin mid 19th cent.: from French caféine, from café ‘coffee’.
See the Oxford Advanced American Dictionary entry: caffeine