Weight loss tips for DH please

Hi all, I'm looking for advice. For quite some time DH (69 next month) has been overweight (we're talking nearly 30 BMI, so not quite obese). He's tried several times to lose weight, but failed mainly because (a) feeling hungry makes him miserable and (b) he doesn't do much exercise (the extra weight means he gets out of breath). I cook healthy, tasty meals (eg Hairy Dieters), which he loves, but come evening he's hitting the sweet snacks. Hopefully today marked a turning point, as his GP told him that he should lose weight to help with his high-ish blood pressure, cholesterol and blood sugar. Any tips to help him please? Thanks in advance.