1 CA500: Survival of the fittest is a tautology from the talk.origins index to creationist claims by Mark Ridley. 2  Is survival of the fittest a tautology by Don Lindsay.
What is healthy weight loss? It's natural for anyone trying to lose weight to want to lose it very quickly. But evidence shows that people who lose weight gradually and steadily (about 1 to 2 pounds per week) are more successful at keeping weight off. Healthy weight loss isn't just about a diet or program. It's about an ongoing lifestyle that includes long-term changes in daily eating and exercise habits.
A safe rate of weight loss, however, is between one and two pounds a week, which means it could take you 25 to 50 weeks to lose 50 pounds. Consuming fewer calories than your body burns is the key to weight loss; every extra 3,500 calories you burn results in the loss of one pound of fat.