I would write something like this. Hope this helps.
If I had a friend who was struggling with their weight, I would be encouraging,
supportive and offer my help. I would offer to join a gym with my friend, take walks and share healthy foods and recipes. Losing weight can de difficult, and for the person trying to lose weight, it may feel like an endless task, but with exercise and a healthy diet, weight loss is possible. Being an encouraging and supportive friend is essential. Reminding them with every pound they lose, they are one step closer to their goal of being healthier.