Studies show that by improving personal eating habits can prevent some of the leading causes of death in the world, such as heart disease, cancer, stroke, some lung diseases and injuries. While a deficit of nutrients can cause vitamin deficiencies, lowered immunity responses, weak muscles, osteoporosis, anaemia, and slower wound healing, amongst other conditions, eating unhealthy things can lead to overweight, obesity, and raised cholesterol levels, with all the problems that these bring.