Oh, love, that's so tough!
If you look at the statistics it's actually pretty common to have troubles with losing weight, around 20% of breastfeeding mothers do, so you're not alone.
Generally it's a hormonal imbalance (which isn't surprising after all the crazy hormonal changes your body goes through). Most women (breastfeeding or not) who are overweight will have high oestrogen, low progesterone and low thyroid hormones.
The fat cells automatically produce oestrogen which leads to less thyroid so your metabolism slows more. Most of these types end up with fat accumulation around their hips. (some people are more the lymphatic type, but the info below will still help you anyway, just a little more exercise is needed for this type)
Here's the important diet bit:
to help balance your female hormones (oestrogen and progesterone) you need to keep your blood sugar level. If you're feeling starved you are DEFINITELY not keeping it level at the moment.
Weight loss during breastfeeding is okay, as long as you don't try to go too quickly. If you're this far along you will have a good, established supply, and as long as you don't go into starvation it shouldn't stop you from breastfeeding.
Something to try:
I won't ask here what type of foods you have in your cupboard, but in general people eat a higher percentage of carbohydrates to proteins. Generally the body type that will accumulate fat more easily really need to eat some good quality protein like eggs, baked beans, salmon on toast, basically anything from an animal or some good quality beans/legumes to start your day.
The next thing I encourage is to have a definite morning and afternoon snack - it doesn't have to be huge, just whatever will keep you from being hungry tip lunch - remember the aim is to keep your sugar stable (blood sugar levels are influenced by food, not just sugar). Generally some yoghurt (try to get the best quality you can afford so it's not too sweet) or perhaps hummous on crackers, or maybe just a small bit of fruit if you're really not hungry.
Ideally you'll be eating something quite fresh at lunch, but again try to keep your protein levels at least at 30% for the meal - a third of your serving (once you get used to it you may find that this is too much or too little for you, experiment after a week or two).
If you feel hungry and want something sugary or fatty try to include a little protein in that snack - it stimulates your fat metabolism which helsp you lose weight and change your hormone profile (hormones are all made of cholesterol) so it's a good thing to do.
Hope this helps :)
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