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Ever since the Vinson study showed that green coffee bean extracts can help overweight women lose weight, green coffee is sexier than roasted one.

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Figure 1: Rel. (vs. control) body weight changes and liver and intraperitoneal adipose tissue weight (Zhang. 2014)

1. Figure 2: Effects of chlorogenic acid (CGA) and caffeine on the hepatic protein expression levels of AMP-activated protein kinase (AMPK), adipose TAG lipase (ATGL) and fatty acid synthase (FAS; Zhang. 2014)

   decreases in the body weight and IPAT weight of mice fed the CGA + caffeine diet,
2. significant decreases in the serum and hepatic concentrations of total cholesterol, TAG and leptin of mice fed the CGA + caffeine diet,
3. increases of the activity of carnitine acyltransferase (CAT) and acyl-CoA oxidase (ACO), 
4. decreased levels of fatty acid synthase (FAS) and the respective mRNA levels
5. significantly upregulated mRNA expression levels of AMP-activated protein kinase (AMPK), CAT and ACO
6. pronounced reductions of PPARg2

• The green coffee (GC) used in this project was Ethiopian Harrar 4 (100% Arabica) and the black coffee (BC) was Sainsbury’s Original Blend Cafetitère Coffee.
• The BC was  a blend of Brazilian, Colombian, Mexican, Nicaraguan, Peruvian, and Rwandan beans.

Table 1: Concentration of total polyphenols and antioxidant capacity determined in GC and BC as compared by the three methods of  coffee preparation (Revuelta-Iniesta. 2014).

Table 2: Comparison of results obtained (mean±SEM) after 14 days of green coffee vs. black coffee intervention (2-week cross over study); F: cortisol; E: cortisone; orange = almost bordeline significant; green = statist. significant inter-group difference (Revuelta-Iniesta. 2014).

Yes, agents like glycerric acid from licorice increase cortisol levels. Contrary to common believe this will yet not trash your testosterone levels and/or induce weight loss - quite the contrary | learn more

Bottom line: While the rodent study by Zhang et al. appears to support the accuracy of the data Vinson et al. published two years ago, you as a SuppVersity reader should be aware of the fact that the reduction in cortisol / cortisone activity Revuelta-Iniesta and Al-Dujaili observed in their subjects is not necessarily going to facilitate weight loss. As discussed in the corresponding Science Round Up, a normal circadian cortisol rhythm with both spikes and troughs is a prerequisite of optimal fat loss, so that its suppression by green coffee beans or other means is beneficial only for those of us who suffer from chronically elevated cortisol levels.

Overall, we are thus left with a single study the whole "green coffee bean for weight loss"-hype is based on. Well, who cares. For the majority of best-selling supplements we dont even have that ;-)

• Jaquet, Muriel, et al. "Impact of coffee consumption on the gut microbiota: a human volunteer study." International journal of food microbiology 130.2 (2009): 117-121.
• Revuelta-Iniesta, R., and E. A. S. Al-Dujaili. "Consumption of Green Coffee Reduces Blood Pressure and Body Composition by Influencing 11β-HSD1 Enzyme Activity in Healthy Individuals: A Pilot Crossover Study Using Green and Black Coffee." BioMed Research International 2014 (2014).
• Vinson, Joe A., Bryan R. Burnham, and Mysore V. Nagendran. "Randomized, double-blind, placebo-controlled, linear dose, crossover study to evaluate the efficacy and safety of a green coffee bean extract in overweight subjects." Diabetes, metabolic syndrome and obesity: targets and therapy 5 (2012): 21.
• Zheng, et al. "Chlorogenic acid and caffeine in combination inhibit fat accumulation by regulating hepatic lipid metabolism-related enzymes in mice." British Journal of Nutrition (2014). Ahead of Print.

5 Low-Calorie Coffee Drinks (under 100 calories)

1. Tall Skinny Latte (100 calories, 0 grams fat, 15 grams carbohydrate, 10 grams protein): You’ll get aboost of protein with this coffee drink, which is a healthy way to start your day. Add sugar-free syrup for flavor if you’d like, or order it iced to decrease the amount of milk and decrease the number of calories.
2. Skinny Cappuccino (60 calories, 0 grams fat, 9 grams carbohydrate, 6 grams protein): The great thing about cappuccino is the foam. The light fluffy top of this drink makes you feel like you’re drinking something much more decadent and fattening.
3. Brewed Coffee or Caffè Americano. Brewed coffee and espresso contain essentially no calories.
4. Skinny Peppermint Mocha (100 calories, 1 gram fat, 13 carbohydrates, 10 grams protein). This coffee drink is sweet and delicious enough to substitute as dessert. A small serving is plenty to satisfy your sweet tooth.
5. Iced Skinny Flavored Latte (60 calories, 0 grams fat, 9 grams carbs, 6 grams protein). Add your favorite sugar-free flavor syrup. Try vanilla, hazelnut, almond, peppermint or other varieties.

Tips for Making Your Own Coffee Drink More Healthy

• Skip the whipped cream. Dont even bother adding whipped cream. It melts into the coffee anyway and you can barely taste it. The calories aren’t worth it. If you add whipped cream to a tall mocha, you add 60 calories and 6 grams of fat.
• Go nonfat. Always start your coffee drink order by stating that you want nonfat milk. Some menu boards may advertise that a drink is low-calorie but the barista may use 2% milk, which has a higher fat and calorie content.
• Say yes to foam. If your drink is topped with foam, ask for extra foam or ask for it to be prepared “dry.” The foam takes up more space in the drink and you decrease the amount of milk used and the number of calories in the drink.
• Add ice (or extra ice). Any drink with ice will have less calories than its hot alternative because the ice has no calories. For a drink that is already iced, ask for extra ice and you’ll get a drink that is less milky, cooler and more refreshing.
• Add spices, not sprinkles. If your drink is displayed on the menu board with sprinkles, skip them and add spice instead. Most coffee shops have cinnamon, cocoa, and nutmeg that you can add for extra flavor.
• Use sugar-free syrups. Flavor syrups are popular additions to coffee drinks, but they are almost pure sugar. Opt for the sugar-free version to cut calories.
• Smaller is better. By the time you get to the coffee counter in the morning, you might order the largest size available out of habit, exhaustionor desperation. For some of us, the need for a coffee fix in the morning is substantial. But err on the small side. You might be surprised to find out that you need less caffeine than you think.