Diet drugs don't make people skinny. Short amounts of exercise adding up to 40 minutes per day, throughout the day, caused more weight loss than 40 minutes of continuous exercise per day. People on low fat diets cannot eat as much as they want. They must still watch calories. They buy low fat choices, but eat too much of those items.
People eat more if they think they are eating less fat.
One set provided as much muscle thickness over 14 weeks as three sets did. There is disagreement as to whether one set was enough to provide the necessary edge after that. When obese people take diet surveys, they underestimate how much fat they eat. Don't know if lying or unconscious omission. Further proof that people get fat by eating too much, versus biological problems.