Those trying to diet and lose weight may actually be hindered in their progress by their coffee consumption. If you want to avoid long term weight gain you should avoid caffeine. You might think in the short term that you can lose more weight by drinking more coffee each day.
This happens as a result of the diuretic effect of coffee, you'll initially lose water but not fat. Caffeine increases stress hormones within your body that increase the risk of hypoglycemia, or low blood sugar levels. You will likely feel hungry sooner than you should as a result of this hormone.
You also aren't helping things by adding extra sugar to your coffee. In conclusion, research has shown that drinking some coffee may actually be good for your health. However, the same research also proves that drinking more than three cups of coffee per day may begin to increase the negative health risks that could arise.