Forget Points and SYNs. The only way to lose weight is to be in Calorie Deficit i.e the body expends more calories than you consume. I found using a calorie checker like My Fitness Pal and Nutracheck apps on my phone very helpful. I used the free version at first but then thought the full App was worth paying for, as it's far cheaper than Slimming World and weight watchers, who charge a lot each month but offer no free ongoing support when you reach your target weight unless you continue to pay.
To lose a one pound a week you need to eat 3500 less calories a week ( 500 a day) less than you currently do, and maybe up your protein intake and reduce amount of carbohydrates. Fresh fruit and vegetables
are healthy but eat more veg than fruit as grapes and bananas add calories quite quickly. The Apps work out the protein and consumed for you when you add your food items.. you will be shocked at how many calories you have been consuming at first. .The Apps have thousands of fresh foods and branded goods in the data base so you just find the food or drink item, work out your portion size ( using scales if necessary) and add the food to the daily counter .
To lose weight I needed to lower my calories to 1200 a day, 3 meals ( portion controlled) a day, stop eating late and no snacks other an apple. I increased my exercise and took up running at age 62 using couch to 5k BBC App.. I run 5k 3 times a week, play tennis and badminton , and aim to do 10.000 steps a day. You can get a simple fitness watch on Amazon for around £30 easily.
Ideally if you can afford it, buy some digital scales for food and a digital bathroom scale, and a fitness watch. You should be able buy all 3 items for less than £100 from Amazon or elsewhere.
I agree with the others who have mentioned the late Michael Moseley's just one thing. I still clean my teeth standing on one leg to improve my balance.
You have to really, really want to do this though as its very hard after a lifetime of gradually putting in weight. I also had to accept that my ' weight maintenance' calories intake is between 1700 to 1800 as my metabolism has slowed down post menopause ( hence the gradual accumulation of middle age spread ).
A friend of mine lost a lot of weight alongside her husband using the Apps and a step counter, where she had previously failed with WW and SW. They both had a daily calorie target and kept tabs on each other's daily limit . They went out for walks together to ensure they both got to 10,000 plus steps. They got a bit competitive over the steps and exercise! ( In a nice way) . It does help if you have someone who also wants to do the journey with you.
Good luck