(Related: The Secret to Happiness? Concentrate on Your Relationships) 4. Estrogen This happy hormone helps form serotonin and protects you from irrita­bility and anxiety, keeping your mood steady.

What are the best sources of plant protein? If you’d like to add more plant-based protein to your diet but aren’t sure where to start, try these foods: Soy milk: Soy’s complete protein makes soy milk ...