Instant coffee is generally not harmful to the body when drunk appropriately, but if consumed in excess, it may cause obesity, affect sleep, and increase the risk of disease. Instant coffee is a common drink, under normal circumstances, reasonable control of the intake of instant coffee, generally will not cause harm to the body. However, because of the high sugar content in instant coffee, if you drink a lot of instant coffee for a long time and have too little activity, it may cause obesity. Secondly, coffee contains a certain amount of caffeine, if you often drink coffee before going to bed, it will affect the quality of sleep, leading to disruption of the biological clock, which is not conducive to daytime work and study. As instant coffee contains trans fatty acids, long-term intake may lead to vascular sclerosis, thus inducing coronary heart disease, which is not conducive to health. In summary, proper drinking of instant coffee will not cause harm to the body, if you drink too much instant coffee, it will not be conducive to health, so daily to limit the amount of instant coffee.