3 links have been added on this idea.
  1. These weight loss sunglasses help you eat less by making your food appear disgusting.
    https://www.telegraph.co.uk/news/health/news/5380229/The-latest-dieting-aid-revealed-blue-tinted-spectacles.html

  2. Scientists think that vision greatly influences appetite, so you could trick your mind into eating less by targeting how you view food.