Chewing gum containing nicotine and caffeine increases metabolism nearly 10 percent according to a recent study.

“Ingredients for obesity management are tea, caffeine and capsaicin, as they increase daily [energy expenditure] with 4–5% [roughly 70 to 100 calories] without increasing energy intake and counteract the decrease in metabolic rate during weight loss,” a recent paper concludes.

“Studies have shown that these ingredients are useful in losing weight or preventing weight regain after weight loss.”

“In adults, the short-term lethal dose for caffeine is estimated at [5,000 to 10,000 mg per day] (either intravenously or orally), which is equivalent to 75 cups of coffee, 125 cups of tea or 200 cola beverages,” a recent paper notes.

Note: A Starbucks Venti (their largest size) brewed coffee contains 415 mg of caffeine.

Therefore, as little as 12 Venti’s would reach a potentially lethal dose of 5,000 mg per day.

After losing 15 pounds in one month on a very-low-calorie diet, people were able to maintain this weight loss either by taking 90 mg of EGCG plus 50 mg of caffeine after each meal, or by eating a high-protein diet containing 100 grams of protein per day, which included 50 grams of a simple protein powder called calcium caseinate according to a study from Maastricht University in Maastricht, Netherlands.

People eating a diet containing adequate protein of only 50-60 grams of protein per day regained 6 pounds during the three months of intended weight maintenance.

Girls who drank 5 cups of coffee or more per week gained 0.5 pounds less over a period of a year than girls who did not drink coffee according to a study from researchers at the Harvard Medical School in Boston, Massachusetts, USA.

The study surveyed 5502 girls who were 14- to 21-years-old, however, this data was limited to those 18 to 21.

Girls who consumed 2 servings of alcohol per week gained 0.7 pounds more over a period of a year than girls who did not consume alcohol according to a study from researchers at the Harvard Medical School in Boston, Massachusetts, USA.

The study surveyed 5502 girls who were 14- to 21-years-old, however, this data was limited to those 18 to 21.

Men and women who consumed three servings of a beverage containing green tea, caffeine and calcium, increased the amount of calories burned each day by 106 calories per day or by 4.6 percent according to a new study from researchers from Lausanne University in Lausanne, Switzerland and Purdue University in West Lafayette, Indiana, USA.

Three hundred (300) mg of caffeine reduces food intake by an average of 21.7 percent in men, but only 3.5 percent in women according to a 1988 study.

A supplement containing green tea catechins, caffeine, capsaicin from hot peppers and the amino acid L-tyrosine increased metabolism in overweight people by 20 calories during the following four hours and increased fat loss by 2 pounds after two months according to a study from A. Belza in Denmark.

Xenadrine-EFX, a nutritional supplement containing bitter orange, green tea and guarana, did not affect metabolism at rest or during light exercise according to a study from University of Chichester in Sussex, UK.

Increasing or decreasing caffeine intake is associated with an increase in body weight of no more than 1 or 2 pounds according to a new study from the University of Madrid in Spain.