I'm know expert but I can help some if your willing to put in the effort anything is possible remember that. Dont do anything drastic, evrything you do that you swing one way you will swing back just as hard and as quick.
Dont start with crazy carido sessions you will burn out quicker, your body will adapt and it will not work anymore.
Pick basic foods with every meal a protien source and a fat source, stick carbs pre and post workout only for a bit
Protien like, chicken, fish, turkey and lean beef/steak
Fats use oils like evoo and mac nut oil, coconut oil, red palm oil, grapseed oil,pb is good but you will always have more than your supposed too trust me.
stick with a slower fiber carb pre and a faster post
so pre like oats/sweet potatoe
post like white rice/ white potatoe
I like to limit choices its much easier to follow, you can spice how you want and add salt too
Try not to fry anything unless in one of those oils. Use baking/steaming
Veggies as much as you want, any meal you want
Keep it simple, you will follow it easier
stick with something for awhile, dont give up right away, the body takes weeks to adjust not overnight unless your allergic to something
try like 50g protien, 20 gr of fat x at least 5 meals 6 is better
start with 200gr of carbs like 50 pre and the rest after
On non training days spread carbs out first few meals than carbless
this is very basic not saying its for you or will work. But give you an idea on what to follow
hit me up anytime