If you exceed the Recommended Daily Allowance of protein (RDA) you increase the risk of getting fat…simple as that. However, this does NOT have to be a problem you face, so long as you consume no more than 1-2g protein per kg body weight per day, or 2-3g per kg body weight if you’re an athlete or regularly placing your muscles under strain i.e. in the gym or tarmac when out running!
Basically an excess of protein calls a process known as Gluconeogenesis into action, this is when the body utilises the amino acids and turns them into glucose. An excess of glucose will result in fat storage and thus weight gain.
Protein can, is, and should continue to be used as a means to weight loss, it’s ability to increase muscle mass inherently increases resting energy expenditure (REE) which in turn burns more calories, and thus fat at rest!
When it comes to protein then, do it…but make sure you do it properly!