My grandfather was in the medical corps in World War One. In his diaries he tells the story of two soldiers in the ward (actually a tent) at the same time; one had a ‘cushy wound on the buttock’ while the other was seriously wounded, his body smashed in many places. No-one expected him to live. But despite his injuries he was positive, kind and concerned about others in the ward. He recovered. In contrast, the guy with the flesh wound was fearful, negative and worried that he might die. In the end, he did.

This is a dramatic and tragic true story of how our thoughts and attitude affect our physical health. I’m sure most of us can relate to it. I once had to say good-bye to my husband at the airport, knowing he wouldn’t be back for nine months. At the time I was recovering from a cold. Within a few hours of that tearful farewell the cold returned with a vengeance and dragged on for another month as I struggled with my emotions.

I know a woman who had struggled with being overweight for many years. One day her sister sat with her and said sorry on behalf of the whole family for the various ways they had hurt her. Within a few months this woman had joined Weight Watchers and over the next year dropped from a size 20 to a beautiful size 14 (USA size 12). Coincidence? Perhaps. But I’m not the only one who’s observed that a lot of eating problems – over-eating, under-eating or unhealthy choices – are just a symptom of an unhappy heart.

‘As a man thinks in his heart, so is he’. These words of wisdom from over 2000 years ago apply just as much today – and science bears it out. Researchers at Harvard measured the immune response of people as they watched various images. When they watched (and engaged with their emotions) scenes of Mother Theresa their immune factors increased. Watching war scenes had the opposite effect.

So much of our physical health starts with our thoughts, and not just the thoughts in our head, but how we really feel in our heart. What emotions do you mostly feel: love, joy, gratefulness, peace? Or anger, fear, worry, boredom and unforgiveness? Even if you know what foods you should be eating to lose weight or keep healthy, your emotions could be sabotaging your most determined attempts.

Before you beat yourself up for not being self-disciplined enough, take some quiet time-out – all by yourself – to check your thoughts and emotions. It may be the key to good health you have been searching for.